Revert "[regalloc] Loop-top values can be backedges too"
This reverts commit abb7cdc9. Reason for revert: regressions in jetstream2/gaussian-blur_sum Original change's description: > [regalloc] Loop-top values can be backedges too > > When counting which backedges conflict with a loop-top phi value, we > should include values introduced at the start of the loop. > > I don't expect this change to make performance differences on its own, > but it is a step toward changing the heuristic so that we're less likely > to introduce unnecessary load/store pairs across the backedge. > > Bug: v8:10606 > Change-Id: I299e388b0b964573119ba0b775d50f398c467c46 > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2385715 > Reviewed-by: Thibaud Michaud <thibaudm@chromium.org> > Commit-Queue: Seth Brenith <seth.brenith@microsoft.com> > Cr-Commit-Position: refs/heads/master@{#69752} TBR=sigurds@chromium.org,yolanda.chen@intel.com,seth.brenith@microsoft.com,thibaudm@chromium.org # Not skipping CQ checks because original CL landed > 1 day ago. Bug: v8:10606, chromium:1126663 Change-Id: Idde0b7c89f2376ae016e834fa37c38f3d9eb5c1e Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2404020Reviewed-by:Seth Brenith <seth.brenith@microsoft.com> Commit-Queue: Seth Brenith <seth.brenith@microsoft.com> Cr-Commit-Position: refs/heads/master@{#69824}
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