[clang] [clang][CrossTU] Indicate weak link attribute in ExternalDefMap. (PR #204188)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,cpp -- clang/test/Analysis/ctu/test-weak-sym-1.c clang/test/Analysis/ctu/test-weak-sym-2.c clang/lib/CrossTU/CrossTranslationUnit.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CrossTU/CrossTranslationUnit.cpp b/clang/lib/CrossTU/CrossTranslationUnit.cpp
index 1a0af60f7..9b6f80dc2 100644
--- a/clang/lib/CrossTU/CrossTranslationUnit.cpp
+++ b/clang/lib/CrossTU/CrossTranslationUnit.cpp
@@ -185,8 +185,8 @@ std::error_code IndexError::convertToErrorCode() const {
 /// @param[out] LookupName  The lookup name in format "<USR-Length>:<USR>". The
 ///                         optional '-' is removed from it.
 /// @param[out] FilePath    The file path "<File-Path>".
-static bool parseCrossTUIndexItem(StringRef LineRef, bool &IsWeak, StringRef &LookupName,
-                                  StringRef &FilePath) {
+static bool parseCrossTUIndexItem(StringRef LineRef, bool &IsWeak,
+                                  StringRef &LookupName, StringRef &FilePath) {
   // `LineRef` is "<USR-Length>:<USR> <File-Path>" now.
 
   size_t USRLength = 0;

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https://github.com/llvm/llvm-project/pull/204188