This way, we can also check the return code of d8. We currently have a
bug (6981) which makes failing tests not being detected, even though
the failure message is (sometimes) being printed.
After this refactoring, we can write tests for our mjsunit test
functions.

R=machenbach@chromium.org

Bug: v8:6981
Change-Id: I0aa0abcb0f9a4f622a1e1d1a4d826da1e6eb4f07
Reviewed-on: https://chromium-review.googlesource.com/737991Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48951}

Duplicate parameters are banned both overall in strict mode and also
in arrow functions. Our error message for both cases blamed strict
mode, which is confusing. This patch fixes the message to point to
arrow functions as a possible source as well.

R=wingo, adamk
LOG=N

Review URL: https://codereview.chromium.org/1236863008

Cr-Commit-Position: refs/heads/master@{#29662}

This commit is a precursor to making lazy arrow function parsing use
similar logic to function(){} argument parsing.

Originally landed in these three CLs:

  https://codereview.chromium.org/1078093002
  https://codereview.chromium.org/1083623002
  https://codereview.chromium.org/1083953002

These were rolled out due to a performance regression on CodeLoad.  This
patchset will fix that by avoiding creation of a DuplicateFinder in the
full parser.

R=marja@chromium.org
BUG=
LOG=N

Review URL: https://codereview.chromium.org/1100713002

Cr-Commit-Position: refs/heads/master@{#27960}

Revert https://codereview.chromium.org/1078093002/ and follow-on parser
patches due to a perf regression.

This reverts commit 53ddccfc.
This reverts commit 71d3213a.
This reverts commit 0f432ebb.
This reverts commit 1dbc4327.

R=marja@chromium.org

Review URL: https://codereview.chromium.org/1094653002

Cr-Commit-Position: refs/heads/master@{#27912}

This commit is a precursor to making lazy arrow function parsing use
similar logic to function(){} argument parsing.

R=arv@chromium.org
BUG=4020
LOG=N

Review URL: https://codereview.chromium.org/1078093002

Cr-Commit-Position: refs/heads/master@{#27773}