Add test for postfix if/unless/while/until #460
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The postfix form for if/unless/while/until is detected in IRB Ruby parser
with special token types of Tk{IF,UNLESS,WHILE,UNTIL}_MOD,
but the detection is a new feature in parser.y after parsed
with EXPR_LABEL bit,
it's introduced after the birth of IRB.
So this is an important test to replace Ruby parser of IRB with Ripper.
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The postfix form for
if/unless/while/untilis detected in IRB Ruby parser with special token types ofTkIF_MOD/TkUNLESS_MOD/TkWHILE_MOD/TkUNTIL_MOD, but the detection is a new feature inparser.yafter parsed withEXPR_LABELbit, it's introduced after the birth of IRB.So this is an important test to replace Ruby parser of IRB with Ripper.