Port r18815 (f93582a)

Original commit message:
Allocate the patcher object on the heap, to avoid occasional stack
overflows on QNX/ARM when entering GetNoCodeAgeSequence.

BUG=v8:3111
LOG=y
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/146993002

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18839 ce2b1a6d-e550-0410-aec6-3dcde31c8c00