[clang] [llvm] [ARM] Emit an error when the hard-float ABI is enabled but can't be used. (PR #111334)

[Chris Copeland via cfe-commits]

chrisnc wrote:

Among those options, my preference would be to remove the clang warning and add the LLVM error so that other frontends can benefit from this checking, as well as the LLVM tools themselves. The LLVM test failures reveal a few places where this issue seems to be ignored.

https://github.com/llvm/llvm-project/pull/111334