PHPDBG: fix bug parsing 3-word opcodes

PHPDBG won't parse opcodes correctly if they are more than two words
separated by underscores (as many opcodes, like ZEND_POST_INC, are).

PHPDBG: fix bug parsing 3-word opcodes

PHPDBG won't parse opcodes correctly if they are more than two words
separated by underscores (as many opcodes, like ZEND_POST_INC, are).

Now opcodes that have more than one underscore (e.g. ZEND_POST_INC) are
parsed correctly.

Closes GH-6895.

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