[clang] [Clang] use constant evaluation context for constexpr if conditions (PR #123667)

[Oleksandr T. via cfe-commits]

================
@@ -2203,6 +2203,12 @@ Parser::ParseCXXCondition(StmtResult *InitStmt, 
SourceLocation Loc,
       return ParseCXXCondition(nullptr, Loc, CK, MissingOK);
     }
 
+    EnterExpressionEvaluationContext Eval(
----------------
a-tarasyuk wrote:

Do you mean using the extra context for this case would introduce unnecessary 
overhead? Should the `if constexpr` be parsed within the same context, but with 
different parsing logic?

https://github.com/llvm/llvm-project/pull/123667
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