tree 6dd0dc185b526b7abd38432af25b121979317c33
parent 387a6440089586f4d59cc248da314e14125f97c7
author Alexander Aprelev <aam@google.com> 1547504372 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1547504372 +0000

Restore TLABs.

This reverts https://github.com/dart-lang/sdk/commit/e9d358921dddbee84c39c951220d5a844b097bb5 and on top of original change it:
 - switches from FreeList used as a filler to ForwardingCorpse because it is not as strict as to be expected only in old space;
 - gets Verifier to accept ForwardingCorpse(as well as FreeList) in new space;
 - asserts that thread is at safepoint(or is busy with one of GC tasks);
 - has slow-path TryAllocateNewTLAB in scavenger.cc, rather than in .h;
 - uses "inline" space_lock Mutex instead of allocating one on the heap;
 - reverts back to less precise used space calculation to avoid requiring threads to be at a safepoint for calculation;
 - adds HeapIterationScope in two places(heap_test.cc and service.cc) to accommodate newly introduced ASSERTs.

Change-Id: I42df716cff6da9651ce7737fa66d7ec2a55905b0
Reviewed-on: https://dart-review.googlesource.com/c/89041
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>