Akira Hatanaka 78ccba6a20 Revert r300932 and r300930.
It seems that r300930 was creating an infinite loop in dag-combine when
compling the following file:

MultiSource/Benchmarks/MiBench/consumer-typeset/z21.c

llvm-svn: 300940
2017-04-21 01:31:50 +00:00
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