[llvm] [X86][APX] Promote 8/16-bit LEA to 32-bit to avoid partial dependence (PR #161051)

[Phoebe Wang via llvm-commits]

phoebewang wrote:

> > Loss of In64BitMode checks?
> 
> Yes, it's only used by MC for disassembling. Here we just use the nodes during codegen.

@KanRobert do we use it here to block generating APX instructions when using `-mtriple=i686-linux -mattr=+ndd`? Anyway, LEA is a legal 32-bit instruction. So we are always good here.

https://github.com/llvm/llvm-project/pull/161051