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

[Shafik Yaghmour via cfe-commits]

================
@@ -15633,3 +15633,17 @@ void ASTContext::recordOffsetOfEvaluation(const OffsetOfExpr *E) {
   if (FieldDecl *FD = Comp.getField(); isPFPField(FD))
     PFPFieldsWithEvaluatedOffset.insert(FD);
 }
+
+bool ASTContext::maybeFoldConstexprWithCast(
----------------
shafik wrote:

I am going to be honest this is ugly. The declaration should have a comment explain what this does b/c it makes sense within the context of this PR but someone coming onto this later on likely not so much.

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