[llvm] [GlobalISel] Add support for value/constants as inline asm memory operand (PR #161501)

[Pierre van Houtryve via llvm-commits]

Pierre-vh wrote:

> I'd prefer not to introduce G_CONSTANT_POOL just for this reason if we can avoid it, unless we canonicalize on G_CONSTANT_POOL for everything and avoid the ambiguity of when to use it or not.

Should I always store on the stack then? 

https://github.com/llvm/llvm-project/pull/161501