[AMDGPU] Do not always add latency between LDSDMA -> S_WAIT_LDSDMA (#201942) In loop bodies we typically see LDSDMA instructions prefetched an iteration or more. Thus, we may have LDSDMA, followed by S_WAIT_LDSDMA that is waiting on prior iteration LDSDMA. Currently, the scheduler thinks there will be a long stall between this LDSDMA and S_WAIT_LDSDMA. This adds some basic checking for LDSDMA and S_WAIT_LDSDMA in the same region to avoid adding latency in cases where we are certain the S_WAIT_LDSDMA does not correspond with the LDSDMA.
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