13b1261175
When both a direct call and an interface call appear on the same line, PGO devirtualization may make a suboptimal decision. In some cases, the directly called function becomes a candidate for devirtualization if no other relevant outgoing edges with non-zero weight exist for the caller's IRNode in the WeightedCG. The edge to this candidate is considered the hottest. Despite having zero weight, this edge still causes the interface call to be devirtualized. This CL prevents devirtualization when the weight of the hottest edge is 0. Fixes #72092 Change-Id: I06c0c5e080398d86f832e09244aceaa4aeb98721 Reviewed-on: https://go-review.googlesource.com/c/go/+/655475 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Michael Pratt <mpratt@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
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