Reviewers: Yang,

Message:
Hi Yang, here is the CL we just discussed, thanks for the look,
--Michael

Description:
Feedback vector: ASAN found memory leaks during AST Numbering pass.

The cause was dynamic allocation of an accounting structure used to
create/initialize the type feedback vector, done at the end of the
numbering pass. The solution is to Zone-allocate the structure to
bring it's lifetime in line with the compilation unit.

BUG=

Please review this at https://codereview.chromium.org/1014793003/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+80, -42 lines):
  M src/ast.h
  M src/ast-numbering.cc
  M src/bootstrapper.cc
  M src/factory.h
  M src/factory.cc
  M src/heap/heap.cc
  M src/type-feedback-vector.h
  M src/type-feedback-vector.cc
  M test/cctest/test-feedback-vector.cc


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