[llvm] [ARM] Prevent use of the VFP calling convention when +soft-float is enabled (PR #221434)

[Peter Smith via llvm-commits]

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smithp35 wrote:

Nothing more that could be achieved. As a toolchain user without any background knowledge of the tools, I think would be surprised that using `-mfloat-abi=soft` disables my integer only MVE unit. Given that the compiler default does the right thing for the target, I expect it isn't a problem in practice, and it isn't something that we can easily change.

https://github.com/llvm/llvm-project/pull/221434