We had two instructions HCompareJsObjectEq and HCompareSymbolEq that behave
exactly the same. I removed one and renamed the remaining instruction into
HCompareObjectEq.
Review URL: http://codereview.chromium.org/7206040

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8349 ce2b1a6d-e550-0410-aec6-3dcde31c8c00