Test mjsunit/allocation-site-info is flaky without explicit gc()

It started failing on arm64 nosnap during a test case where complex nested
literal arrays are created.

R=machenbach@chromium.org
BUG=

Review URL: https://codereview.chromium.org/367703002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22125 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
BuildGrowElementsCapacity bounds check used wrong elements kind.

In a refactoring, HGraphBuilder::BuildGrowElementsCapacity() ended up
using the old_elements_kind instead of new_kind when calculating if a
new capacity for an array exceeds Page::kMaxRegularHeapObjectSize.

Repair, such that the check is correct.

R=hpayer@chromium.org
BUG=

Review URL: https://codereview.chromium.org/366583006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22126 ce2b1a6d-e550-0410-aec6-3dcde31c8c00