Debug: support breakpoints set in the middle of statement

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/16093040

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15416 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Ensure CheckInitialized is present independent of define.

This makes sure that the same symbols are present, independent of which
defines have been used while building V8. Otherwise only embedders with
compatible defines would be able to link against that binary.

R=danno@chromium.org
BUG=chromium:255779

Review URL: https://codereview.chromium.org/18305004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15417 ce2b1a6d-e550-0410-aec6-3dcde31c8c00