[PowerPC] add tests for bit hacking opportunities with setcc; NFC
[PowerPC] add tests for bit hacking opportunities with setcc; NFC

We likely gave up on folding some select-of-constants patterns in 
IR with rL331486, and we need to recover those in the DAG.

The tests without select are based on our current DAGCombiner 
optimizations for select-of-constants.



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@335390 91177308-0d34-0410-b5e6-96231b3b80d8

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