The macro is currently used by AllocateHeapNumberStub and AllocateMutableHeapNumberStub, which are now turbofan code stubs.
It can be used to allocate objects in the new or old space, optionally with double alignment.

BUG=588692
LOG=y

Review URL: https://codereview.chromium.org/1735803003

Cr-Commit-Position: refs/heads/master@{#34424}