Add MSA and f16 inline ASM support for MIPS

[beetrees]

This PR adds vector register support for MIPS inline ASM when using the MSA extension (MSA specification), as well as adding support for the f16 type.

Ping target maintainers of MIPS targets: @Itus-Shield @Gelbpunkt @ayrtonm @LukasWoodtli @wzssyqa @chenx97 @709924470 @Cyanoxygen @Fearyncess

Tracking issues:
f16 inline ASM: #125398 (part of #116909)
MIPS inline ASM: #93335
MIPS target features: #150253

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[rustbot]

rustc_codegen_gcc is developed in its own repository. If possible, consider making this change to rust-lang/rustc_codegen_gcc instead.

cc @antoyo, @GuillaumeGomez