[clang] [clang] Accept empty enum in MSVC compatible C (PR #159981)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/test/Parser/ms-empty-enum.c clang/lib/Parse/ParseDecl.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index 5e9867501..a0707f1ea 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -5360,13 +5360,13 @@ void Parser::ParseEnumBody(SourceLocation StartLoc, Decl *EnumDecl,
   T.consumeOpen();
 
   // C does not allow an empty enumerator-list, C++ does [dcl.enum].
- if (Tok.is(tok::r_brace) && !getLangOpts().CPlusPlus) {
-   if (getLangOpts().MicrosoftExt)
-     Diag(T.getOpenLocation(), diag::ext_ms_c_empty_enum_type)
-         << SourceRange(T.getOpenLocation(), Tok.getLocation());
-   else
-     Diag(Tok, diag::err_empty_enum);
- }
+  if (Tok.is(tok::r_brace) && !getLangOpts().CPlusPlus) {
+    if (getLangOpts().MicrosoftExt)
+      Diag(T.getOpenLocation(), diag::ext_ms_c_empty_enum_type)
+          << SourceRange(T.getOpenLocation(), Tok.getLocation());
+    else
+      Diag(Tok, diag::err_empty_enum);
+  }
 
   SmallVector<Decl *, 32> EnumConstantDecls;
   SmallVector<SuppressAccessChecks, 32> EnumAvailabilityDiags;

``````````

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https://github.com/llvm/llvm-project/pull/159981