[clang] [AArch64] Add soft-float ABI (PR #74460)

[David Spickett via cfe-commits]

DavidSpickett wrote:

That makes sense. Didn't realise we had an `fp` flag, I don't see it in `llvm/include/llvm/TargetParser/AArch64TargetParser.h`.


https://github.com/llvm/llvm-project/pull/74460