[Clang][ARM] Ensure FPU Features are parsed when targeting `cc1as` (#134612)

Previously, `cc1as` did not consider the Features that can be included
from a target's FPU. This could lead to a situation where assembly files
could not compile as cc1as did not know if a feature was supported.

With this change, all the features for the FPU will be passed to `cc1as`
as `-target-feature` lines. By making this change, it will enable
`+nosimd` to be functional, worked on in #130623, and fix a regression
introduced in 8fa0f0ef so
armv7s-apple-darwin targets can utilise VFPv4 correctly.

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Co-authored-by: Martin Storsjö <martin@martin.st>