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Author SHA1 Message Date
Sanjoy Das 107aefc2fc Mark guards on true as "trivially dead" 
This moves some logic added to EarlyCSE in rL268120 into
`llvm::isInstructionTriviallyDead`.  Adds a test case for DCE to
demonstrate that passes other than EarlyCSE can now pick up on the new
information.

llvm-svn: 268126
 2016-04-29 22:23:16 +00:00
Justin Bogner 395c2127ed PM: Port DCE to the new pass manager 
Also add a very basic test, since apparently there aren't any tests
for DCE whatsoever to add the new pass version to.

llvm-svn: 267196
 2016-04-22 19:40:41 +00:00