Port #[rustc_layout_scalar_valid_range_start/end] to the new attribute parsing infrastructure

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

compiler/rustc_attr_parsing/src/session_diagnostics.rs

@@ -503,6 +503,7 @@ pub(crate) struct NakedFunctionIncompatibleAttribute {
 pub(crate) enum AttributeParseErrorReason {
     ExpectedNoArgs,
     ExpectedStringLiteral { byte_string: Option<Span> },
+    ExpectedIntegerLiteral,
     ExpectedAtLeastOneArgument,
     ExpectedSingleArgument,
     ExpectedList,
@@ -543,6 +544,9 @@ 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);