Carl Ritson c16f776028 [AMDGPU] Move kill lowering to WQM pass and add live mask tracking ...

Move implementation of kill intrinsics to WQM pass. Add live lane
tracking by updating a stored exec mask when lanes are killed.
Use live lane tracking to enable early termination of shader
at any point in control flow.

Reviewed By: piotr

Differential Revision: https://reviews.llvm.org/D94746

2021-02-11 20:31:29 +09:00

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