[PATCH] D103232: [AtomicExpandPass][AArch64] Promote xchg with floating-point types to integer ones

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Follow the same strategy used for atomic loads/stores by converting the operands to equally-sized integer types.
This change prevents the atomic expansion pass from generating illegal LL/SC pairs when targeting AArch64: `expand-atomicrmw-xchg-fp.ll` would previously instantiate intrinsics such as `llvm.aarch64.ldaxr.p0f32` that cannot be lowered.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103232

Files:
  llvm/lib/CodeGen/AtomicExpandPass.cpp
  llvm/test/CodeGen/AArch64/atomicrmw-xchg-fp.ll
  llvm/test/CodeGen/X86/atomicf128.ll
  llvm/test/Transforms/AtomicExpand/AArch64/expand-atomicrmw-xchg-fp.ll
  llvm/test/Transforms/AtomicExpand/X86/expand-atomic-xchg-fp.ll

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