[X86][SchedModel] Fixed some wrong scheduling model found by code inspection.
Source: Agner Fog's Instruction tables.

Related to <rdar://problem/15607571>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214940 91177308-0d34-0410-b5e6-96231b3b80d8