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Add full softfloat and hardfloat support for MIPS.

Description

Add full softfloat and hardfloat support for MIPS.

This adds new target architectures for hardfloat:
mipselhf mipshf mips64elhf mips64hf.

Tested in QEMU only.

Sponsored by: DARPA, AFRL
Sponsored by: HEIF5
Differential Revision: https://reviews.freebsd.org/D8376