Matthias Braun 8a5b46737a ScheduleDAGInstrs: Comment on why subreg defs are not seen as uses; NFC ...

Usually subregister definitions are consider uses of the remaining
lanes that did not get defined. Add a comment why the code in
ScheduleDAGInstrs does not add use dependencies regardless.

llvm-svn: 269107

2016-05-10 20:11:58 +00:00

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