Fix the regression of PR#2137
Fix the regression of PR#2137

The PR (https://github.com/GPUOpen-Drivers/llpc/pull/2137) has a latent
issue of reading TF from on-chip LDS. We mistakenly use CreateLoad which
always assumes the alignment is from the specified load type. Rather, we
can only ensure the alignment is dword. So CreateAlignedLoad should be
used instead to explicitly specify dword alignment.

GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc