x86-64: Add vector asin/asinf to libmvec microbenchmark

Add vector asin/asinf and input files to libmvec microbenchmark.

libmvec-asin-inputs:
  90% Normal random distribution
  range: (-1.0, 1.0)
  mean: 0.0
  sigma: 1.0
  10% uniform random distribution in range (-1.0, 1.0)

libmvec-asinf-inputs:
  90% Normal random distribution
  range: (-1.0f, 1.0f)
  mean: 0.0f
  sigma: 1.0f
  10% uniform random distribution in range (-1.0f, 1.0f)

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

sysdeps/x86_64/fpu/Makeconfig

@@ -53,6 +53,7 @@ libmvec-funcs = \
 # Define libmvec function for benchtests directory.
 libmvec-bench-funcs = \
   acos \
+  asin \
   atan \
   cos \
   exp \