Make LeakSanitizer happy, part 1.

Bumped an assembler buffer on the way, it is necessary for some combinations of debugging flags.

Note that the allocation profiler still leaks, this is handled in a separate CL.

R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/152643006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@19128 ce2b1a6d-e550-0410-aec6-3dcde31c8c00