[clang] [llvm] [ARM] Add support for Windows SEH (PR #184953)

[Trung Nguyen via cfe-commits]

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trungnt2910 wrote:

On a related note, this commit only implements `__try`/`__except` and expects the `/EHs-` flag to be passed for C++ code. My use case was using MSVC-mode `clang` to build Windows kernel drivers.

https://github.com/llvm/llvm-project/pull/184953