Small tweak to switch statements: use a smaller base class.

glslang/Include/intermediate.h

@@ -566,7 +566,7 @@ protected:
 // in between (if any) consecutive case/defaults.  So, a traversal need only deal with
 // 0 or 1 nodes per case/default statement.
 //
-class TIntermSwitch : public TIntermAggregate {
+class TIntermSwitch : public TIntermNode {
 public:
     TIntermSwitch(TIntermTyped* cond, TIntermAggregate* b) : condition(cond), body(b) { }
     virtual void traverse(TIntermTraverser*);

glslang/MachineIndependent/ParseHelper.cpp

@@ -1594,6 +1594,8 @@ void TParseContext::wrapupSwitchSubsequence(TIntermAggregate* statements, TInter
     }
     if (branchNode)
         switchSequence->push_back(branchNode);
+
+    // TODO: semantics: verify no duplicated case values
 }
 
 //