[X86] Add TB_NO_REVERSE to some memory folding table entries where the register form...

[X86] Add TB_NO_REVERSE to some memory folding table entries where the register form requires 64-bit mode, but the memory form does not.

We don't know if its safe to unfold if we're in 32-bit mode.

This is simlar to what was done to some load opcodes in r363523.

I think its pretty unlikely we will try to unfold these anyway so
I don't think this is testable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@363595 91177308-0d34-0410-b5e6-96231b3b80d8