[clang] [llvm] [X86][Windows] Return `fp128` on the stack (PR #204887)

[Trevor Gross via cfe-commits]

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tgross35 wrote:

MSVC and MinGW should be matching for these types, so I believe you could merge `CHECK-MSVC64-F128` and `CHECK-MINGW-F128` into `CHECK-WIN64-F128` (same for i128).

Could also be separate since I think this was true before this PR

https://github.com/llvm/llvm-project/pull/204887