[llvm] [llvm][gvn-sink] Don't try to sink inline asm (PR #138414)

[Paul Kirth via llvm-commits]

ilovepi wrote:

I updated `canReplaceOperandWithVariable()` too and tested it w/o the change in GVNSink.cpp. I'm happy to update or remove either of those if you'd prefer.

https://github.com/llvm/llvm-project/pull/138414