Stopped calling inherited setters when creating object literals (issue 1015).

Changed interpretation of malformed \c? escapes in RegExp to match JSC.

Enhanced the command-line debugger interface and fixed some minor bugs in the debugger.

Performance improvements on the IA32 platform.

Review URL: http://codereview.chromium.org/6113004

git-svn-id: http://v8.googlecode.com/svn/trunk@6238 ce2b1a6d-e550-0410-aec6-3dcde31c8c00