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

[Erich Keane via cfe-commits]

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

No, more that this applies to the expressoin on 2213 as well as the CXXCondition on 2221 (which looks like a recursive call?).  I just want to make sure we're not applying this context to stuff that it shouldn't be here.  

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