runtime:cpu4: TestCmpIfaceConcreteAlloc failures

[gopherbot]

#!watchflakes
default <- pkg == "runtime:cpu4" && test == "TestCmpIfaceConcreteAlloc"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestCmpIfaceConcreteAlloc
    iface_test.go:70: iface cmp allocs=1; want 0
--- FAIL: TestCmpIfaceConcreteAlloc (0.12s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "runtime:cpu4" && test == "TestCmpIfaceConcreteAlloc"

2025-10-10 19:44 gotip-netbsd-arm64 go@955a5a0d runtime:cpu4.TestCmpIfaceConcreteAlloc (log)

=== RUN   TestCmpIfaceConcreteAlloc
    iface_test.go:70: iface cmp allocs=1; want 0
--- FAIL: TestCmpIfaceConcreteAlloc (0.12s)

— watchflakes

[mknyszek]

In triage, this probably just needs a greater number than 1 passed to AllocsPerRun.

[gopherbot]

Change https://go.dev/cl/712201 mentions this issue: runtime: increase repeat count for alloc test