[clang] [X86] Add ABI handling for __float128 (PR #75156)

[Phoebe Wang via cfe-commits]

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+// RUN: %clang_cc1 -triple x86_64-linux -emit-llvm  -target-feature +sse2 < %s | FileCheck %s --check-prefixes=CHECK
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phoebewang wrote:

Yes, e.g, `llvm/test/CodeGen/X86/{soft-fp,x87}.ll`, though I doubt if they can work in reality since they are calling to the same lib functions.

https://github.com/llvm/llvm-project/pull/75156