Remove some unnecessary PredicateMethod overrides. Add RenderMethod overrides to remove forwarding in the X86AsmParser code itself. No functional change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189205 91177308-0d34-0410-b5e6-96231b3b80d8
Make sure x86 instructions using ssmem/sdmem operand types are only able to parse memory operands of the proper size in Intel syntax. Primarily affects some of sse cvt instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189206 91177308-0d34-0410-b5e6-96231b3b80d8