[llvm] Register assembly printer passes (PR #138348)

[Matthias Braun via llvm-commits]

MatzeB wrote:

This currently changes AArch64 and X86 to register their AsmPrinter passes and adjusts some tests that seem like they just wanted to run assembly printing.

Putting this up for comments/feedback before I do all the typing for the other 23 targets... Or would be acceptable to land this with just some targets adapted?

https://github.com/llvm/llvm-project/pull/138348