powerpc64le: switch long double to IEEE binary128

Change powerpc64le's long double from 64-bit double to IEEE 754
binary128 (quad, 113-bit mantissa), matching aarch64 and riscv64.

Gated on FreeBSD

powerpc64le: switch long double to IEEE binary128

Change powerpc64le's long double from 64-bit double to IEEE 754
binary128 (quad, 113-bit mantissa), matching aarch64 and riscv64.

Gated on FreeBSD 16 and powerpc64le only.

Differential Revision: https://reviews.freebsd.org/D57388
Reviewed by: adrian
Relnotes: yes

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