This is another step towards improving TSAN and test coverage of
concurrent paths.

By purging reconstructible (background-serialized or never-serialized)
ObjectData instances from the cache after serialization, we increase
ObjectData-construction activity on the background thread.

Note that this means ObjectData is no longer canonicalized - two
instances can point at the same underlying object. Losing this
property is unfortunate, but we can revert back to it once work on the
concurrency project is further advanced.

Bug: v8:7790
Change-Id: I44b1366f61dc9087cddc76939512abed17e28d61
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2844661
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74221}

... this will avoid the need to pass AllocationPolicy to every method
that can allocate/deallocate and allows to make deallocation method
implementation stateful.

The latter will also allow implementing accounting of deallocated zone
memory.

Adding one more field is generally fine because usually these hashmap
objects are allocated on the stack or inside other rarely-allocated
long-lived objects.
The only exception is Scope class. The Scope objects are created very
often during parsing and each of them has a VariableMap field.
The Scope object size issue will be addressed in a follow-up CL.

Bug: v8:10572
Change-Id: I63fbd41246cf2e568c8ba80c213d3e9caffc2c87
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2284992Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Clemens Backes <clemensb@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68877}

This change adds an infrastructure to "snapshot" data that is being
serialized only once. This data lives in its own per-isolate zone, wrapped
in a new CompilerData class.

This change reduces the "serialize standard objects" on TypeScript
benchmark from ~69ms to ~30ms (more than 50% improvement).

Bug: v8:7790
Change-Id: I6ce4f6fb993334969662fdd993d681945a9f3727
Reviewed-on: https://chromium-review.googlesource.com/1238920
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56309}