Revert "Increase the target new space size to the max new space size"

TBR=hpayer@chromium.org
BUG=v8:3626
LOG=n

Review URL: https://codereview.chromium.org/724543003

Cr-Commit-Position: refs/heads/master@{#25314}
Move public symbols to the root set.

This allows serializing public symbols that are embedded in code.

BUG=v8:3689
LOG=N
R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/722723002

Cr-Commit-Position: refs/heads/master@{#25315}
X87: Leaving a generator via an exception causes it to close

port 24a7ee877e1fe2ba0a52d69061946aeda7c26c10 (r25297)

original commit message:

  Leaving a generator via an exception causes it to close

BUG=
R=weiliang.lin@intel.com

Review URL: https://codereview.chromium.org/724643002

Patch from Chunyang Dai <chunyang.dai@intel.com>.

Cr-Commit-Position: refs/heads/master@{#25316}
Reland "[turbofan] Weakening of types must weaken ranges inside unions."

This relands commit 4c1f4b796d1c455fc6a023abe145a5e48c4b7b1f.

R=rossberg@chromium.org

Review URL: https://codereview.chromium.org/723023002

Cr-Commit-Position: refs/heads/master@{#25317}
Fix landing candidate pushes.

BUG=chromium:410721
LOG=n
TBR=tandrii@chromium.org
TEST=script_test.py

Review URL: https://codereview.chromium.org/725503003

Cr-Commit-Position: refs/heads/master@{#25318}
[turbofan] add some registerallocator unittests

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/700753003

Cr-Commit-Position: refs/heads/master@{#25319}
Enable harmony tests for TurboFan that now pass.

R=jarin@chromium.org
TEST=mjsunit/harmony

Review URL: https://codereview.chromium.org/723983002

Cr-Commit-Position: refs/heads/master@{#25320}
Move BailoutReason and flags computation to post-pass

R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/668143003

Cr-Commit-Position: refs/heads/master@{#25321}