No need to start Ticker for Crankshaft

Crankshaft doesn't depend on the sampler thread any more. No
need to start the that thread for Crankshaft.

BUG=v8:2609

Review URL: https://codereview.chromium.org/13526003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14166 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix bug in bignum implementation.

R=mstarzinger@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/13454019

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14167 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Remove LOGGER macro

Use already saved isolate pointer and avoid TLS lookup when
retrieving Logger instance

BUG=None

Review URL: https://codereview.chromium.org/13529004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14168 ce2b1a6d-e550-0410-aec6-3dcde31c8c00