[clang] [C++20][Modules] Omit imported PCM file info for explicitly mapped header units (PR #235597)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/test/Modules/cxx20-import-paths.cpp clang/lib/Serialization/ASTReader.cpp clang/lib/Serialization/ASTWriter.cpp clang/lib/Serialization/GlobalModuleIndex.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 63ce30239..de1c24491 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -1585,7 +1585,8 @@ void ASTWriter::WriteControlBlock(Preprocessor &PP, StringRef isysroot) {
     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // ImportLoc
     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Module name len
     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Standard C++ mod
-    Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // C++20/prebuilt HU
+    Abbrev->Add(
+        BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1));       // C++20/prebuilt HU
     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // File size
     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // File timestamp
     Abbrev->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // File name raw kind

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https://github.com/llvm/llvm-project/pull/235597