[clang] [clang] Allow C-style casts in constexpr in MS compatible mode (PR #197005)

[via cfe-commits]

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@@ -2587,8 +2587,10 @@ APValue *VarDecl::evaluateValueImpl(SmallVectorImpl<PartialDiagnosticAt> &Notes,
   if (IsConstantInitialization &&
       (Ctx.getLangOpts().CPlusPlus ||
        (isConstexpr() && Ctx.getLangOpts().C23)) &&
-      !Notes.empty())
-    Result = false;
+      !Notes.empty()) {
+    if (!Ctx.maybeFoldMSConstexpr(Notes))
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eleviant wrote:

Yep, I couldn't imagine how this may happen

https://github.com/llvm/llvm-project/pull/197005