[llvm] (reland) [GlobalISel] Diagnose inline assembly constraint lowering errors (PR #139049)

[Pierre van Houtryve via llvm-commits]

Pierre-vh wrote:

@vitalybuka The sanitizer aarch64 buildbot keeps failing on this. It appears to build with globalisel, -Werr and it uses an unsupported constraint in its inline asm. 

This is just exposing a bug in the testcase IMO. I'd like to avoid reverting the patch again. How can we proceed?

https://github.com/llvm/llvm-project/pull/139049