x86-64: Add vector cosh/coshf to libmvec microbenchmark

x86-64: Add vector cosh/coshf to libmvec microbenchmark

Add vector cosh/coshf and input files to libmvec microbenchmark.

libmvec-cosh-inputs:
  90% Normal random distribution
  range: (-710.0, 710.0)
  mean: 0.0
  sigma: 32.0
  10% uniform random distribution in range (-500.0, 500.0)

libmvec-coshf-inputs:
  90% Normal random distribution
  range: (-89.0f, 89.0f)
  mean: 0.0f
  sigma: 16.0f
  10% uniform random distribution in range (-50.0f, 50.0f)

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>