[clang] [clang-tools-extra] [clang][NFC] Refactor `CXXNewExpr::InitializationStyle` (re-land) (PR #71417)

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cor3ntin wrote:

@steakhal Thanks for raising this. 

I agree this stretches the definition of NFC commit.
But it was dully reviewed and approved https://github.com/llvm/llvm-project/pull/71322 

We usually do not make any guarantees as the stability of the C++ interfaces, so as this test did not exist when this change was committed, I am not sure anything was actually broken.

Please let us know if this change is disruptive to you though, thanks!





https://github.com/llvm/llvm-project/pull/71417