Fix SparseIDE with IterativeIDESolver - #857
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Using a sparse ICFG with the
IterativeIDESolverdid not sparsify:advanceToNextUser()was non-const, therefore inaccessible from a const ICFG&.Also,
SparseLLVMBasedICFGViewwas incompatible withICFGBase, which requiresgetNumCallSites().Finally, did some quick benchmark whether caching
advanceToNextUserhelps; it does not; it rather hurts performance; so dropped the cache.