v8/test/message/isvar.out

*%(basename)s:31: SyntaxError: builtin %%IS_VAR: not a variable
%%IS_VAR(x+x);
           ^
SyntaxError: builtin %%IS_VAR: not a variable
Change 'Parse error' to three more informative messages. Replace the 'unable_to_parse' key used in three places with three difference keys. Provide three more informative and less ambiguous error messages in place of 'Parse error'. Add three test/message cases to cover the new messages. BUG=2636 Review URL: https://codereview.chromium.org/14161007 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14462 ce2b1a6d-e550-0410-aec6-3dcde31c8c00 2013-04-26 14:26:54 +00:00			`*%(basename)s:31: SyntaxError: builtin %%IS_VAR: not a variable`
			`%%IS_VAR(x+x);`
			`^`
			`SyntaxError: builtin %%IS_VAR: not a variable`