[AMDGPU] Add MaxMemoryClauseSchedStrategy (#114957)
Also expose an option to choose custom scheduler strategy:
amdgpu-sched-strategy={max-ilp|max-memory-clause}
This can be set through either function attribute or command line option.
The major behaviors of the max memory clause schedule strategy includes:
1. Try to cluster memory instructions more aggressively.
2. Try to schedule long latency load earlier than short latency
instruction.
I tested locally against about 470 real shaders and got the perf
changes (only count perf changes over +/-10%):
About 15 shaders improved 10%~40%.
Only 3 shaders drops ~10%.
(This was tested together with another change which increases the
maximum clustered dword from 8 to 32).
I will make another change to make that threshold configurable.
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