[clang] Add a flag to preserve the old macro behaviour. (PR #174895)

[Snehasish Kumar via cfe-commits]

================
@@ -345,7 +351,10 @@ void CGDebugInfo::setLocation(SourceLocation Loc) {
   if (Loc.isInvalid())
     return;
 
-  CurLoc = CGM.getContext().getSourceManager().getFileLoc(Loc);
+  if (DebugInfoMacroExpansionLoc)
+    CurLoc = CGM.getContext().getSourceManager().getExpansionLoc(Loc);
+  else
+    CurLoc = CGM.getContext().getSourceManager().getFileLoc(Loc);
----------------
snehasish wrote:

Done.

https://github.com/llvm/llvm-project/pull/174895
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