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

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You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/test/SemaCXX/microsoft-constexpr-SFINAE.cpp clang/test/SemaCXX/microsoft-constexpr-SFINAE2.cpp clang/test/SemaCXX/microsoft-constexpr.cpp clang/test/SemaCXX/microsoft-constexpr2.cpp clang/test/SemaCXX/microsoft-constexpr3.cpp clang/include/clang/AST/Expr.h clang/lib/AST/ByteCode/State.cpp clang/lib/AST/ByteCode/State.h clang/lib/AST/ExprConstant.cpp clang/lib/Sema/SemaExpr.cpp clang/lib/Sema/SemaOverload.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/AST/Expr.h b/clang/include/clang/AST/Expr.h
index 102dcbc7d..44a0c1e0e 100644
--- a/clang/include/clang/AST/Expr.h
+++ b/clang/include/clang/AST/Expr.h
@@ -622,11 +622,11 @@ public:
     /// Whether any diagnostic has been emitted. This is set regardless of
     /// whether @ref #Diag is set or not.
     bool DiagEmitted = false;
-    
+
     /// Whether part of expression is an LValue.
     /// Used when evaluating constant expression with Microsoft extensions.
     bool HasLValue = false;
-    
+
     /// Whether we've seen a ptr to int cast or null subobject while evaluating
     /// constant expression in MS compatibility mode.
     bool SeenCastOrNull = false;

``````````

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