Reviewers: Yang, danno,
Description:
Reintroduce runtime zone to Isolate.
In case tcmalloc is not being used, the malloc()/free() overhead
can be significant for several runtime functions like StringReplace.
Therefore we reintroduce the runtime_zone into Isolate and reenable
the segment caching functionality of Zone.
There's now also a simpler version of ZoneScope w/o nesting capabilities.
BUG=v8:2759
Please review this at https://codereview.chromium.org/18635003/
SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge
Affected files:
M src/isolate.h
M src/isolate.cc
M src/runtime.cc
M src/zone.h
M src/zone.cc
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