Explicitly choose x86 softfloat/hardfloat ABI#136146

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RalfJung wants to merge 2 commits intorust-lang:masterfrom RalfJung:x86-abi

+164-63

Commits on Jan 29, 2025

platform-support docs: fix x87 errata footnotes
RalfJung
committed

Commits on Jan 30, 2025

add rustc_abi to control ABI decisions LLVM does not have flags for, and use it for x86 softfloat
RalfJung
committed