Instead of having feedback vector as a subtype of FixedArray with
reserved slots, make it a first-class variable-sized object with a
fixed-size header. This allows us to compress counters to ints in the
header, rather than forcing them to be Smis.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_chromium_rel_ng
Change-Id: Icc5f088ffbc2e2651b845bc71ea42060639e3e48
Reviewed-on: https://chromium-review.googlesource.com/585129
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#46935}

BUG=v8:5402

Change-Id: If5f763e6a11d446e36719277a18b00a0cd8df8fa
Reviewed-on: https://chromium-review.googlesource.com/517162
Commit-Queue: Marja Hölttä <marja@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45565}

Previously, both type feedback vector and the shared function info
of a function points to the matching type feedback metadata. This
makes finding the shared function info of a type feedback vector
difficult.

Instead, we now point the type feeback vector to the shared function
info, and find the metadata through the shared function info.

Also remove the obsolete empty type feedback vector.

R=hpayer@chromium.org, mvstanton@chromium.org
BUG=v8:5808

Review-Url: https://codereview.chromium.org/2672363002
Cr-Commit-Position: refs/heads/master@{#43026}

BUG=

Change-Id: I31b8da09f4728d55c2da91966edcad49528b554b
Reviewed-on: https://chromium-review.googlesource.com/439146Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#43003}

... and TypeFeedbackMetadata to FeedbackMetadata.

BUG=

Change-Id: I2556d1c2a8f37b8cf3d532cc98d973b6dc7e9e6c
Reviewed-on: https://chromium-review.googlesource.com/439244
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Reviewed-by: Hannes Payer <hpayer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#42999}

The InterpreterTester class cobbles together a JSFunction from
a manually created bytecode and feedback vector. However it's
fragile against design changes in the way literal arrays and
feedback vectors are handled. It's better to let it hand in
a feedback vector metadata object, and allow the system to
create the vector from that.

BUG=v8:5456

Review-Url: https://codereview.chromium.org/2652893010
Cr-Commit-Position: refs/heads/master@{#42684}

Thus TypeFeedbackMetadata can now be shared between different native contexts.

Review URL: https://codereview.chromium.org/1384673002

Cr-Commit-Position: refs/heads/master@{#31143}

This CL also allows to use arbitrary number of feedback vector elements for particular slot kind.

Review URL: https://codereview.chromium.org/1370303004

Cr-Commit-Position: refs/heads/master@{#31050}