[X86] Split WriteFDiv schedule classes to support single/double scalar, XMM and YMM/ZMM instructions.

This removes all InstrRW overrides for these instructions - some x87 overrides remain but most use default (and realistic) values.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331643 91177308-0d34-0410-b5e6-96231b3b80d8
17 files changed