[SparcV9]: Use SRL instead of SLL to clear top 32-bits in ctpop:i32. SLL does not clear top 32 bit, only SRL does.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198280 91177308-0d34-0410-b5e6-96231b3b80d8