runtime: guarantee checkfinalizers test allocates in a shared tiny block
Currently the checkfinalizers test (TestDetectCleanupOrFinalizerLeak)
only *tries* to ensure the tiny alloc with a cleanup attached shares a
block with other objects. However, what it does is insufficient, because
it could get unlucky and have the last object allocated be the first
object of a new block.
This change changes the test to guarantee that a tiny object is not at
the start of a fresh block by looking at the alignment of the object's
pointer. If the object's pointer is odd, then that's good enough to know
that it shares a block with something else, since the blocks themselves
are aligned to a much higher power of two.
This fixes a failure I've seen on the builders.
Fixes #73810.
Change-Id: Ieafdbb9cccb0d2dc3659a9a5d9d9233718461635
Reviewed-on: https://go-review.googlesource.com/c/go/+/674655
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com>