Rollup merge of #138182 - durin42:llvm-21-fp128-windows, r=tgross35 rustc_target: update x86_win64 to match the documented calling convention for f128 llvm/llvm-project@5ee1c0b7148571ed9d60e447b66fb0f35de14576 updates llvm to match the documented calling convention to pass f128 indirectly. This change makes us do that on all versions of LLVM, not just starting with LLVM 21. `@rustbot` label llvm-main try-job: dist-x86_64-msvc try-job: dist-x86_64-mingw try-job: x86_64-msvc-1 try-job: x86_64-msvc-2 try-job: x86_64-mingw-1 try-job: x86_64-mingw-2
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