Fangrui Song 5fa53d1593 [DemandedBits] Remove some redundancy in the work list ...

InputIsKnownDead check is shared by all operands. Compute it once.

For non-integer instructions, use Visited.insert(I).second to replace a
find() and an insert().

llvm-svn: 355290

2019-03-03 14:50:01 +00:00

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