Make top-level rustc_parse functions fallible.

Currently we have an awkward mix of fallible and infallible functions:
```
       new_parser_from_source_str
 maybe_new_parser_from_source_str
       new_parser_from_file
(maybe_new_parser_from_file)        // missing
      (new_parser_from_source_file) // missing
 maybe_new_parser_from_source_file
       source_str_to_stream
 maybe_source_file_to_stream
```
We could add the two missing functions, but instead this commit removes
of all the infallible ones and renames the fallible ones leaving us with
these which are all fallible:
```
new_parser_from_source_str
new_parser_from_file
new_parser_from_source_file
source_str_to_stream
source_file_to_stream
```
This requires making `unwrap_or_emit_fatal` public so callers of
formerly infallible functions can still work.

This does make some of the call sites slightly more verbose, but I think
it's worth it for the simpler API. Also, there are two `catch_unwind`
calls and one `catch_fatal_errors` call in this diff that become
removable thanks this change. (I will do that in a follow-up PR.)

compiler/rustc_parse/src/lib.rs

@@ -35,7 +35,7 @@ mod errors;
 rustc_fluent_macro::fluent_messages! { "../messages.ftl" }
 
 // Unwrap the result if `Ok`, otherwise emit the diagnostics and abort.
-fn unwrap_or_emit_fatal<T>(expr: Result<T, Vec<Diag<'_>>>) -> T {
+pub fn unwrap_or_emit_fatal<T>(expr: Result<T, Vec<Diag<'_>>>) -> T {
     match expr {
         Ok(expr) => expr,
         Err(errs) => {
@@ -47,25 +47,28 @@ fn unwrap_or_emit_fatal<T>(expr: Result<T, Vec<Diag<'_>>>) -> T {
     }
 }
 
-/// Creates a new parser from a source string.
-pub fn new_parser_from_source_str(psess: &ParseSess, name: FileName, source: String) -> Parser<'_> {
-    unwrap_or_emit_fatal(maybe_new_parser_from_source_str(psess, name, source))
-}
-
-/// Creates a new parser from a source string. Returns any buffered errors from lexing the initial
-/// token stream; these must be consumed via `emit`, `cancel`, etc., otherwise a panic will occur
-/// when they are dropped.
-pub fn maybe_new_parser_from_source_str(
+/// Creates a new parser from a source string. On failure, the errors must be consumed via
+/// `unwrap_or_emit_fatal`, `emit`, `cancel`, etc., otherwise a panic will occur when they are
+/// dropped.
+pub fn new_parser_from_source_str(
     psess: &ParseSess,
     name: FileName,
     source: String,
 ) -> Result<Parser<'_>, Vec<Diag<'_>>> {
-    maybe_new_parser_from_source_file(psess, psess.source_map().new_source_file(name, source))
+    let source_file = psess.source_map().new_source_file(name, source);
+    new_parser_from_source_file(psess, source_file)
 }
 
-/// Creates a new parser, aborting if the file doesn't exist. If a span is given, that is used on
-/// an error as the source of the problem.
-pub fn new_parser_from_file<'a>(psess: &'a ParseSess, path: &Path, sp: Option<Span>) -> Parser<'a> {
+/// Creates a new parser from a filename. On failure, the errors must be consumed via
+/// `unwrap_or_emit_fatal`, `emit`, `cancel`, etc., otherwise a panic will occur when they are
+/// dropped.
+///
+/// If a span is given, that is used on an error as the source of the problem.
+pub fn new_parser_from_file<'a>(
+    psess: &'a ParseSess,
+    path: &Path,
+    sp: Option<Span>,
+) -> Result<Parser<'a>, Vec<Diag<'a>>> {
     let source_file = psess.source_map().load_file(path).unwrap_or_else(|e| {
         let msg = format!("couldn't read {}: {}", path.display(), e);
         let mut err = psess.dcx.struct_fatal(msg);
@@ -74,23 +77,21 @@ pub fn new_parser_from_file<'a>(psess: &'a ParseSess, path: &Path, sp: Option<Sp
         }
         err.emit();
     });
-
-    unwrap_or_emit_fatal(maybe_new_parser_from_source_file(psess, source_file))
+    new_parser_from_source_file(psess, source_file)
 }
 
 /// Given a session and a `source_file`, return a parser. Returns any buffered errors from lexing
 /// the initial token stream.
-fn maybe_new_parser_from_source_file(
+fn new_parser_from_source_file(
     psess: &ParseSess,
     source_file: Lrc<SourceFile>,
 ) -> Result<Parser<'_>, Vec<Diag<'_>>> {
     let end_pos = source_file.end_position();
-    let stream = maybe_source_file_to_stream(psess, source_file, None)?;
+    let stream = source_file_to_stream(psess, source_file, None)?;
     let mut parser = Parser::new(psess, stream, None);
     if parser.token == token::Eof {
         parser.token.span = Span::new(end_pos, end_pos, parser.token.span.ctxt(), None);
     }
-
     Ok(parser)
 }
 
@@ -99,14 +100,14 @@ pub fn source_str_to_stream(
     name: FileName,
     source: String,
     override_span: Option<Span>,
-) -> TokenStream {
+) -> Result<TokenStream, Vec<Diag<'_>>> {
     let source_file = psess.source_map().new_source_file(name, source);
-    unwrap_or_emit_fatal(maybe_source_file_to_stream(psess, source_file, override_span))
+    source_file_to_stream(psess, source_file, override_span)
 }
 
 /// Given a source file, produces a sequence of token trees. Returns any buffered errors from
 /// parsing the token stream.
-fn maybe_source_file_to_stream<'psess>(
+fn source_file_to_stream<'psess>(
     psess: &'psess ParseSess,
     source_file: Lrc<SourceFile>,
     override_span: Option<Span>,
@@ -139,13 +140,18 @@ pub fn parse_in<'a, T>(
 pub fn fake_token_stream_for_item(psess: &ParseSess, item: &ast::Item) -> TokenStream {
     let source = pprust::item_to_string(item);
     let filename = FileName::macro_expansion_source_code(&source);
-    source_str_to_stream(psess, filename, source, Some(item.span))
+    unwrap_or_emit_fatal(source_str_to_stream(psess, filename, source, Some(item.span)))
 }
 
 pub fn fake_token_stream_for_crate(psess: &ParseSess, krate: &ast::Crate) -> TokenStream {
     let source = pprust::crate_to_string_for_macros(krate);
     let filename = FileName::macro_expansion_source_code(&source);
-    source_str_to_stream(psess, filename, source, Some(krate.spans.inner_span))
+    unwrap_or_emit_fatal(source_str_to_stream(
+        psess,
+        filename,
+        source,
+        Some(krate.spans.inner_span),
+    ))
 }
 
 pub fn parse_cfg_attr(