Implement RegionStoreManager::iterBindings().  This implementation only returns the base region in the binding key instead of the region + offset.  It isn't clear if this is the best semantics, but most clients will likely only care about simple bindings, or bindings to a particular variable.  We can refine later if necessary.
Implement RegionStoreManager::iterBindings().  This implementation only returns the base region in
the binding key instead of the region + offset.  It isn't clear if this is the best semantics, but most
clients will likely only care about simple bindings, or bindings to a particular variable.  We can
refine later if necessary.

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@106183 91177308-0d34-0410-b5e6-96231b3b80d8

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