Add predicate method check match memory operand size, if available.

Add predicate method check match memory operand size, if available.

In att style asm syntax memory operand size is derived from suffix attached with mnemonic.  In intel style asm syntax it is part of memory operand hence predicate method check is required to select appropriate instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148006 91177308-0d34-0410-b5e6-96231b3b80d8