[PATCH] D59144: RegPressure: Fix crash on blocks with only dbg_value

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
Herald added subscribers: jdoerfert, javed.absar, nhaehnle, wdng, jvesely, MatzeB.

If there were only dbg_values in the block, recede would hit the
beginning of the block and try to use thet dbg_value as a real
instruction.

This may be incomplete, since I am still able to reproduce another assert
I hit while reducing the original testcase, and at another point working on this patch.
The second assert is however resisting attempts to come up with a reduced testcase.


https://reviews.llvm.org/D59144

Files:
  lib/CodeGen/RegisterPressure.cpp
  test/CodeGen/AMDGPU/debug-value-scheduler-crash.mir

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