[clang] [Clang] [ARM] Ensure FPU Features are collected when using the Clang Assembler (PR #134366)

[Martin Storsjö via cfe-commits]

mstorsjo wrote:

Regardless of whether this is backportable or not (it probably isn't), it's probably nicer for future digging into the history to land this as a separate split out part from the rest of #130623 (which currently changes quite a lot of different things), as this is mostly an independent step required by the rest of that PR.

But as it's @Stylie777 driving that change, it probably makes most sense if he takes over this PR, or we close it and he opens a separate one under his own name.

https://github.com/llvm/llvm-project/pull/134366