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

[Sergei Barannikov via cfe-commits]

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@@ -287,6 +287,8 @@ def ext_string_too_long : Extension<"string literal of length %0 exceeds "
   "support">, InGroup<OverlengthStrings>;
 def err_character_too_large : Error<
   "character too large for enclosing character literal type">;
+def err_exec_charset_conversion_failed
+    : Error<"conversion to execution encoding failed: '%0'">;
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s-barannikov wrote:

This error is issued in many places, but lacks test coverage.

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