[PowerPC] reorder entries in P9InstrResources.td in alphabetical order; NFC

Reorder entries added in my previous commit (rL328969) to keep alphabetical order.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@329064 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed