[X86][BtVer2] Fix WriteFShuffle256 schedule write info.

This patch fixes the number of micro opcodes, and processor resource cycles for
the following AVX instructions:

vinsertf128rr/rm
vperm2f128rr/rm
vbroadcastf128

Tests have been regenerated using the usual scripts in the llvm/utils directory.

Differential Revision: https://reviews.llvm.org/D51492

llvm-svn: 341185