[clang] [llvm] Enable fexec-charset option (PR #138895)

[Abhina Sree via llvm-commits]

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@@ -367,6 +373,25 @@ static unsigned ProcessCharEscape(const char *ThisTokBegin,
     HadError = true;
   }
 
+  if (Transcode && Converter) {
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abhina-sree wrote:

I will extend the condition here to check for both of these

https://github.com/llvm/llvm-project/pull/138895