Auto merge of #142921 - JonathanBrouwer:rustc_attributes_parser, r=oli-obk

Port `#[rustc_layout_scalar_valid_range_start/end]` to the new attrib…

Ports `rustc_layout_scalar_valid_range_start` and `rustc_layout_scalar_valid_range_end` to the new attribute parsing infrastructure for https://github.com/rust-lang/rust/issues/131229#issuecomment-2971353197

r? `@jdonszelmann`

compiler/rustc_attr_parsing/src/session_diagnostics.rs

@@ -510,6 +510,7 @@ pub(crate) struct NakedFunctionIncompatibleAttribute {
 pub(crate) enum AttributeParseErrorReason {
     ExpectedNoArgs,
     ExpectedStringLiteral { byte_string: Option<Span> },
+    ExpectedIntegerLiteral,
     ExpectedAtLeastOneArgument,
     ExpectedSingleArgument,
     ExpectedList,
@@ -550,6 +551,9 @@ impl<'a, G: EmissionGuarantee> Diagnostic<'a, G> for AttributeParseError {
                     diag.span_label(self.span, "expected a string literal here");
                 }
             }
+            AttributeParseErrorReason::ExpectedIntegerLiteral => {
+                diag.span_label(self.span, "expected an integer literal here");
+            }
             AttributeParseErrorReason::ExpectedSingleArgument => {
                 diag.span_label(self.span, "expected a single argument here");
                 diag.code(E0805);