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

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ostannard wrote:

> I'm a little surprised we don't need any LLVM backend changes, but I guess in soft-float mode we basically treat floats as ints anyway, so maybe things just work. I'd like to see appropriate regression tests, though (if they don't already exist).

Yes, the backend already treated floats as if they were an integer of the same width, so no changes are needed there. I've added a test for the backend.

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