[llvm] [AMDGPU] Fix has_single_bit assertion for Mask in SIInstrInfo (PR #109785)

[Georgi Mirazchiyski via llvm-commits]

GeorgeWeb wrote:

Fixes failures caused from https://github.com/llvm/llvm-project/commit/6cfe6a6b3e9578be80120add7fbe19506f747196. (see https://github.com/llvm/llvm-project/pull/108416#issuecomment-2370955271)

https://github.com/llvm/llvm-project/pull/109785