[clang] [Clang] Optimize some `getBeginLoc` implementations (PR #141058)

[Erich Keane via cfe-commits]

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@@ -3187,9 +3215,48 @@ class CallExpr : public Expr {
   SourceLocation getRParenLoc() const { return RParenLoc; }
   void setRParenLoc(SourceLocation L) { RParenLoc = L; }
 
-  SourceLocation getBeginLoc() const LLVM_READONLY;
-  SourceLocation getEndLoc() const LLVM_READONLY;
+  SourceLocation getBeginLoc() const {
+    if (CallExprBits.HasTrailingSourceLoc) {
+        assert(CallExprBits.HasTrailingSourceLoc && "No trailing source loc");
+        static_assert(sizeof(CallExpr) <=
+                      offsetToTrailingObjects + sizeof(SourceLocation));
+        return *reinterpret_cast<const SourceLocation *>(
+            reinterpret_cast<const char *>(this) + sizeof(CallExpr));
+    }
+
+    if (usesMemberSyntax()) {
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erichkeane wrote:

no curleys on single liners?

https://github.com/llvm/llvm-project/pull/141058