Rework use of loc::SymbolVal in the retain/release checker to use the new method
SVal::getAsLocSymbol(). This simplifies the code and allows the retain/release checker to (I believe) also correctly reason about location symbols wrapped in SymbolicRegions. Along the way I cleaned up SymbolRef a little, disallowing implicit casts to 'unsigned'. llvm-svn: 65972
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