[clang] [clang][Preprocessor] Handle the first pp-token in EnterMainSourceFile (PR #145244)

[via cfe-commits]

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@@ -351,7 +351,7 @@ class Preprocessor {
   bool LastTokenWasAt = false;
 
   /// First pp-token in current translation unit.
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yronglin wrote:

Good catch! Updated.

https://github.com/llvm/llvm-project/pull/145244