[libc][aarch64] Enable a bunch of math functions.

Namely, these are the functions enabled: rint*, lrint*, llrint*, lround*,
llround*, nearbyint*. They were previously not enabled because they
required rounding mode and FP exception support. Now that rounding mode
and FP exception support is available for Aarch64, they can be enabled.

GitOrigin-RevId: 53fcf6bb62714c2bcba76d763f516be451a71b76
1 file changed