[X86] Added missing mayLoad/mayStore attributes to some X86 instructions.

Throughout the effort of automatically generating the X86 memory folding tables these missing information were encountered.
This is a preparation work for a future patch including the automation of these tables.

Differential Revision: https://reviews.llvm.org/D31714



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300190 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed