[LoopVectorize] Add accessors for Num{Stores,Loads,PredStores} in AccessAnalysis
[LoopVectorize] Add accessors for Num{Stores,Loads,PredStores} in AccessAnalysis

These members are moving to LoopAccessAnalysis.  The accessors help to hide
this.

NFC.  This is part of the patchset that splits out the memory dependence logic
from LoopVectorizationLegality into a new class LoopAccessAnalysis.
LoopAccessAnalysis will be used by the new Loop Distribution pass.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@227750 91177308-0d34-0410-b5e6-96231b3b80d8

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