[llvm] [AMDGPU] Fix getAsmVOP3Base call agruments. (PR #144572)

[Shilei Tian via llvm-commits]

shiltian wrote:

> I thought HasSrcMods is for mod in asm string, but it's actually for dag? If this is the case, it surpises me that none of the vop3 insts hit this issue in upstream

I thought the same thing as well…I think I did run into some issues with src mods in some downstream effort.

https://github.com/llvm/llvm-project/pull/144572