[X86] Add TB_NO_REVERSE to entries in the load folding table where the...

[X86] Add TB_NO_REVERSE to entries in the load folding table where the instruction's load size is smaller than the register size.

If we were to unfold these, the load size would be increased to the register size. This is not safe to do since the enlarged load can do things like cross a page boundary into a page that doesn't exist.

I probably missed some instructions, but this should be a large portion of them.

llvm-svn: 288001