Labeled Breaks (not the G-word)

http://libssh2.org/patches/labeled_break.diff A few notes about the implementation: * The parser is modified slightly to catch T_BREAK T_LNUMBER ';' and T_BREAK T_STRING ';' specifically. This is in-line with the decision to remove the ability to jump to variable targets. e.g. break $foo; will result in an E_PARSE. * current break container is moved from op1.u.opline_num to extended_value (This means updating continue; as well) * op1 is used to store the label's name until pass_two(), at that point it's converted to a jmp_addr. Non-labeled breaks leave op1 unused and jmp_addr explicitly set to NULL * zend_brk opcode handler updated to use op1->u.jmp_addr if available (labeled breaks), or el->brk (numbered breaks) if not. zend_brk and zend_cont both updated per current break container change above. * Labeled breaks must target the same break container or higher within the same op_array, and must only jump "forward" in execution. These checks are handled in pass_two() which is the earliest point at which all labeled are declared. * Label hash is only allocated/initialized if labels are declared. Known Issues: * When an error is thrown from pass_two(), the error message states it's in Unknown on line 0. Gotta find a better way to handle that.... * This adds an element to zend_op_array so be sure to either make clean or at least touch Zend/*.c after applying it otherwise you'll be in segfault country. -Sara