[clang] [clang] Fix a use-after-free in expression evaluation (PR #118480)

[kadir çetinkaya via cfe-commits]

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@@ -4515,6 +4515,8 @@ handleLValueToRValueConversion(EvalInfo &Info, const Expr *Conv, QualType Type,
       }
 
       APValue Lit;
+      // Make sure we clean up the temporary created below.
+      FullExpressionRAII CleanupTemps(Info);
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kadircet wrote:

> we could probably construct some examples that break after this change.

fair enough, i am not sure about the change either. wanted to throw it out to get some more thoughts from community.

> Could we get a reduced test case?

i hope so. i am still running a creduce, file is still too big though :(

https://github.com/llvm/llvm-project/pull/118480