Avoid some unnecessary fast-properties map creations.

(1) When we have just normalized and re-fastified a map, we don't need to copy it again to set the is_prototype bit.
(2) When defining accessors causes a non-prototype object to go slow, don't force re-fastification.

BUG=v8:3267
LOG=n
R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/706243002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25221 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Classes: Partial fix for constructor not calling super

Introduce two new function kind, one for default constructor and one
for default constructor call super. Then when we are about to pares
these we just generate the correct AST in source.

BUG=v8:3661, v8:3672
LOG=Y
R=dslomov@chromium.org

Review URL: https://codereview.chromium.org/700523003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@25222 ce2b1a6d-e550-0410-aec6-3dcde31c8c00