[X86][Znver1] Remove WriteFMul/WriteFRcp InstRW overrides/aliases.

Fixes x87 schedules to more closely match Agner - AMD doesn't tend to "special case" x87 instructions as much as Intel.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331645 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed