Matthias Braun a25e13aaf1 Do not track subregister liveness when it brings no benefits ...

Some subregisters are only to indicate different access sizes, while not
providing any way to actually divide the register up into multiple
disjunct parts. Avoid tracking subregister liveness in these cases as it
is not beneficial.

Differential Revision: http://reviews.llvm.org/D8429

llvm-svn: 232695

2015-03-19 00:21:58 +00:00

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