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efficient, NFC. Previously, we built up vectors of function pointers to track readers and writers. The primary problem here is that we would add the same function to this vector every time we found an instruction that reads or writes to the pointer. This could be a *lot* of redudant function pointers. Instead of doing that, we can use a SmallPtrSet. This does more than just reduce the size of the list of readers or writers. We walk the entire lists of each and do a map lookup for each one. By having sets, we will only do one map lookup per reader or writer function. But only one user of the pointer analyzer actually needs this information, so we can also skip accumulating it (and doing a lot of heap allocations) for all the other pointer analysis. This is particularly useful because there are very many more pointers in some of the other cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242950 91177308-0d34-0410-b5e6-96231b3b80d8
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