Class 'Environment' no longer should subclass llvm::FoldingSetNode.

Environment hasn't been uniqued in a FoldingSet for some time, so this
was just wasting a pointer in GRState.

llvm-svn: 73645

clang/include/clang/Analysis/PathSensitive/Environment.h

@@ -30,9 +30,8 @@ class EnvironmentManager;
 class BasicValueFactory;
 class LiveVariables;
 
-class Environment : public llvm::FoldingSetNode {
+class Environment {
 private:
-    
   friend class EnvironmentManager;
   
   // Type definitions.