Bug 885463 - Warn about 'yield' without operand. r=Waldo.
Add passing test for bug 826124 which went away with JM. no_r=me.
Bug 844805, part 1 - Don't use the pn_op field of PNK_DOT/ELEM nodes. r=Waldo.
Bug 844805, part 2 - Don't even set the pn_op field of PNK_DOT/ELEM nodes. r=Waldo.
Bug 844805, part 3 - Remove two calls to FoldConstants from the parser. r=Waldo.