Reviewers: Kasper Lund, Feng Qian,

Description:
Allocate room for expected number of properties based on the
constructor in the JSObject. This removes the need to allocate
a properties array if the object is never assigned any extra
properties.


Please review this at http://codereview.chromium.org/7341

Affected files:
   M     src/bootstrapper.cc
   M     src/builtins-ia32.cc
   M     src/heap.cc
   M     src/objects-debug.cc
   M     src/objects-inl.h
   M     src/objects.h
   M     src/objects.cc
   M     src/runtime.cc
   M     src/string-stream.cc
   M     src/stub-cache-arm.cc
   M     src/stub-cache-ia32.cc



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