value bindings.  Along with a small change to OSAtomicChecker, this
resolves <rdar://problem/7527292> and resolves some long-standing
issues with how values can be bound to the same physical address by
not have the same "key".  This change is only a beginning; logically
RegionStore needs to better handle loads from addresses where the
stored value is larger/smaller/different type than the loaded value.
We handle these cases in an approximate fashion now (via
CastRetrievedVal and help in SimpleSValuator), but it could be made
much smarter.

llvm-svn: 93137

llvm-svn: 91511

Fix null dereference in OSAtomicChecker and special case SymbolicRegions.  We still aren't handling them correctly; I've added to failing test cases to test/Analysis/NSString-failed-cases.m that should pass and then be merged in to test/Analysis/NSString.m.

llvm-svn: 90993

llvm-svn: 90968