HLSL: Implement switch/case/default.

hlsl/hlslParseHelper.h

@@ -147,6 +147,9 @@ public:
     void pushScope()       { symbolTable.push(); }
     void popScope()        { symbolTable.pop(0); }
 
+    void pushSwitchSequence(TIntermSequence* sequence) { switchSequenceStack.push_back(sequence); }
+    void popSwitchSequence() { switchSequenceStack.pop_back(); }
+
 protected:
     void inheritGlobalDefaults(TQualifier& dst) const;
     TVariable* makeInternalVariable(const char* name, const TType&) const;
@@ -166,7 +169,6 @@ protected:
     int structNestingLevel;      // 0 if outside blocks and structures
     int controlFlowNestingLevel; // 0 if outside all flow control
     TList<TIntermSequence*> switchSequenceStack;  // case, node, case, case, node, ...; ensure only one node between cases;   stack of them for nesting
-    TList<int> switchLevel;      // the statementNestingLevel the current switch statement is at, which must match the level of its case statements
     bool inEntrypoint;           // if inside a function, true if the function is the entry point
     bool postMainReturn;         // if inside a function, true if the function is the entry point and this is after a return statement
     const TType* currentFunctionType;  // the return type of the function that's currently being parsed