[llvm] [NFC][AMDGPU] Assert no bad shift operations will happen (PR #108416)

[Paul Walker via llvm-commits]

paulwalker-arm wrote:

This PR looks to have broken the build, at least for me because I'm seeing `llvm/lib/Target/AMDGPU/SIInstrInfo.cpp:9796: error: no matching function for call to ‘has_single_bit(int64_t&)’`, which go away when I revert this commit.

https://github.com/llvm/llvm-project/pull/108416