[llvm] [RegAllocFast] fold foldable inline asm (PR #74344)

[Nick Desaulniers via llvm-commits]

nickdesaulniers wrote:

Adding this special case just for INLINEAM (that probably don't exist in most MachineBasicBlocks) (that probably don't have foldable operands) kinda sucks, but I couldn't think of a better approach.  Any ideas for how to handle this problem differently/better?

https://github.com/llvm/llvm-project/pull/74344