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

[Trevor Gross via llvm-commits]

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tgross35 wrote:

I think it's better to split into a `(*T) -> T` to show returning cc and `(T, *T)` to show calling cc (or some tests use a global static rather than a pointer). Since for LINUX here it just shows that pass and return are the same but not what they are.

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