[TTI] Add getPrefetchDistance from PPCLoopDataPrefetch, NFC
This patch is part of the work to make PPCLoopDataPrefetch target-independent (http://thread.gmane.org/gmane.comp.compilers.llvm.devel/92758). As it was discussed in the above thread, getPrefetchDistance is currently using instruction count which may change in the future. llvm-svn: 258995
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