Attempt to fix GC mole failures.

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/614393002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24370 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
[turbofan] re-enable some tests for arm64.

Those tests were disabled because of an issue in TruncateDoubleToI which has
been fixed since.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/605253002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24371 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
MIPS64: Fix ConvertDToI test.

TEST=cctest/test-code-stubs-mips64/ConvertDToI
BUG=
R=paul.lind@imgtec.com

Review URL: https://codereview.chromium.org/616853004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24372 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Debug a mystery crash bug in script streaming.

This adds a bunch of checks so we hopefully get more detailed information about
what exactly goes wrong.

R=jochen@chromium.org
BUG=

Review URL: https://codereview.chromium.org/619583005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24373 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/bleeding_edge' into bleeding_edge