Do not include cached code in the start-up snapshot.

Do not include cached code in the start-up snapshot.

The non-monomorphic cache and the code stub cache contain
stubs that are not really useful immediate at start-up.
For example we have a lot of RecordWriteStubs for different
register combinations.

This cuts the start-up snapshot size by another 1/3.

R=verwaest@chromium.org

[Toon Verwaest, 2015-03-09 12:32:50]

lgtm with comment

https://codereview.chromium.org/991803002/diff/20001/src/api.cc
File src/api.cc (right):

https://codereview.chromium.org/991803002/diff/20001/src/api.cc#newcode396
src/api.cc:396: *i::UnseededNumberDictionary::New(i_isolate, 128, i::TENURED));
What about extracting the original constructor from CreateInitialObjects() onto
heap somewhere, and calling that? E.g., as ResetCodeCaches();