[clang] [clang][SourceManager] Reuse code when computing Column and Line numbers (PR #166593)

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


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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/include/clang/Basic/SourceManager.h clang/lib/Basic/SourceManager.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/include/clang/Basic/SourceManager.h b/clang/include/clang/Basic/SourceManager.h
index 6b7daebb3..bc9e97863 100644
--- a/clang/include/clang/Basic/SourceManager.h
+++ b/clang/include/clang/Basic/SourceManager.h
@@ -1429,10 +1429,12 @@ public:
   /// diagnostic.
   unsigned getLineNumber(FileID FID, unsigned FilePos, bool *Invalid = nullptr) const;
   unsigned getLineNumber(SourceLocation Loc, bool *Invalid = nullptr) const;
-  unsigned getSpellingLineNumber(SourceLocation Loc, bool *Invalid = nullptr) const {
+  unsigned getSpellingLineNumber(SourceLocation Loc,
+                                 bool *Invalid = nullptr) const {
     return getLineNumber(getSpellingLoc(Loc), Invalid);
   }
-  unsigned getExpansionLineNumber(SourceLocation Loc, bool *Invalid = nullptr) const {
+  unsigned getExpansionLineNumber(SourceLocation Loc,
+                                  bool *Invalid = nullptr) const {
     return getLineNumber(getExpansionLoc(Loc), Invalid);
   }
   unsigned getPresumedLineNumber(SourceLocation Loc, bool *Invalid = nullptr) const;

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https://github.com/llvm/llvm-project/pull/166593