Create new branch for V8 5.1

[ofrobots]

Checklist

• tests and code linting passes
• the commit message follows commit guidelines

Affected core subsystem(s)

deps, test

Description of change

deps: upgrade to V8 5.1.281.24 [vee-eight-5.1]

Pick up the latest branch-head for V8 5.1. This branch brings in
improved language support and performance improvements. For full
details: http://v8project.blogspot.com/2016/04/v8-release-51.html

• Picks up the latest branch head for 5.1 [1]
• Edit v8 gitignore to allow trace_event copy
• Update V8 DEP trace_event as per deps/v8/DEPS [2]
• Fix tests.

[1] v8/v8@f81c34e
[2] https://chromium.googlesource.com/chromium/src/base/trace_event/common/+/c8c8665c2deaf1cc749d9f8e153256d4f67bf1b8

R=@nodejs/v8
CI: https://ci.nodejs.org/job/node-test-pull-request/2440/

[ofrobots]

@misterdjules Do you have any ideas about the dtrace compile issue on SmartOS: https://ci.nodejs.org/job/node-test-commit-smartos/2266/nodes=smartos14-32/console

[bnoordhuis]

@misterdjules StandardFrameConstants::kMarkerOffset was replaced with CommonFrameConstants::kContextOrFrameTypeOffset. V8's tools/gen-postmortem-data.py and node's src/v8abbr.h and src/v8ustack.d need updating.

For reference: v8/v8@9dcd085 and v8/v8@cbd91c5. The commit log mentions StandardFrameConstants::kFrameOffset but I don't think that was ever a thing. Maybe a leftover from an earlier revision of the CL.

@ofrobots You might want to float this patch for now to get past the build error:

diff --git a/configure b/configure
index 03a889d..8839e12 100755
--- a/configure
+++ b/configure
@@ -736,7 +736,7 @@ def configure_node(o):
   if flavor in ('solaris', 'mac', 'linux', 'freebsd'):
     use_dtrace = not options.without_dtrace
     # Don't enable by default on linux and freebsd
-    if flavor in ('linux', 'freebsd'):
+    if flavor in ('linux', 'freebsd', 'solaris'):
       use_dtrace = options.with_dtrace

     if flavor == 'linux':

I've tried restarting the armv8 build job but the CI is very, very slow right now.

[ofrobots]

Temporarily disabled dtrace by default on solaris, as per suggestion from @bnoordhuis. New CI: https://ci.nodejs.org/job/node-test-pull-request/2456/.

[mhdawson]

For my own gratification, CI run on linuxOne: https://ci.nodejs.org/job/node-test-commit-linuxone-mdawson/nodes=rhel72-s390x/22/, all green :)

[ofrobots]

It turns out that

• @davepacheco already provided a potential fix for this: Head's up: Frame marking changes in V8 ToT post-mortem#21 (comment), and
• I already fixed gen-postmortem-data.py upstream when the V8 lkgr + node.js integration builds caught this originally.

I have updated the PR with the patch from @davepacheco, and removed the temporary fix. New CI: https://ci.nodejs.org/job/node-test-pull-request/2461/

[ofrobots]

CI is green. @nodejs/v8 please review.

[bnoordhuis]

Can you either use the full URL (https://github.com/v8/v8/commit/879b617b) or the v8/v8@879b617b syntax in second commit? Otherwise LGTM.

[ofrobots]

Thanks, fixed commit message, and landed on vee-eight-5.1 as c2bbfe2...098d365.