Fix polymorphic inlined calls with migrating prototypes

LOG=Y
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/104793003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18307 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Fix off-by-one error in AstTyper, part 2.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/112933002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18308 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Ensure that Code objects' kind specific flags are initialized properly.

Also, have the stub cache set a valid MajorKey on stubs it creates.
Getting weird random bits frightens and confuses the poor simple type feedback oracle.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/108443004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18309 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'