[SDAG] expand ctpop != 1
Change the generic ctpop expansion to more efficiently handle a
check for not-a-power-of-two value:
(ctpop x) != 1 --> (x == 0) || ((x & x-1) != 0)
This is the inverted predicate sibling pattern that was added with:
D63004
This should have been done before I changed IR canonicalization to
favor this form with:
rL364246
...so if this requires revert/changing, the earlier commit may also
need to modified.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364319
91177308-0d34-0410-b5e6-
96231b3b80d8
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