Philip Reames 206f10d3f6 Plumb InstructionCost through unroll costing
Teach the unroller(s) how to handle an invalid cost. This avoids crashes when the backend can't provide a cost due to either a fundemental limitation or an unimplemented cost model case.

Differential Revision: https://reviews.llvm.org/D127305
2022-06-09 15:42:53 -07:00
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2020-09-17 15:56:13 -07:00
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