[analyzer] Aggressively cut back on the canonicalization in RegionStore.
Whenever we touch a single bindings cluster multiple times, we can delay canonicalizing it until the final access. This has some interesting implications, in particular that we shouldn't remove an /empty/ cluster from the top-level map until canonicalization. This is good for a 2% speedup or so on the test case in <rdar://problem/12810842> llvm-svn: 169523
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