[clang] [clang] Stop simplifyConstraint at embedded NUL (PR #196223)

[Jeremy Morse via cfe-commits]

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@@ -1072,6 +1072,9 @@ TargetInfo::simplifyConstraint(StringRef Constraint,
                                SmallVectorImpl<ConstraintInfo> *OutCons) const {
   std::string Result;
 
+  // Stop at '\0' to match the old behavior.
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jmorse wrote:

I'd suggest wording this to avoid the reader having to consider when "old" might be: something like "Ignore embedded nulls to match prior clang (clang-21 and earlier) behaviours".

https://github.com/llvm/llvm-project/pull/196223