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0906f80f16
When TTI was updated to use an explicit cost, TCK_CodeSize was used although the default implicit cost would have been the hand-wavey cost of size and latency. So, revert back to this behaviour. This is not expected to have (much) impact on targets since most (all?) of them return the same value for SizeAndLatency and CodeSize. When optimising for size, the logic has been changed to query CodeSize costs instead of SizeAndLatency. This patch also adds a testing option in the unroller so that OptSize thresholds can be specified. Differential Revision: https://reviews.llvm.org/D85723
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