Fix bugs that broke typedefs in function definitions.

Issue #118.

parse.yy

@@ -495,8 +495,9 @@ declaration_statement
     {
         if ($1->declSpecs->storageClass == SC_TYPEDEF) {
             for (unsigned int i = 0; i < $1->declarators.size(); ++i) {
-                m->AddTypeDef($1->declarators[i]->sym);
+                m->AddTypeDef($1->declarators[i]->GetSymbol());
             }
+            $$ = NULL;
         }
         else {
             std::vector<VariableDeclaration> vars = $1->GetVariableDeclarations();

tests/typedef-3.ispc

@@ -0,0 +1,14 @@
+
+export uniform int width() { return programCount; }
+
+export void f_fu(uniform float RET[], uniform float aFOO[], uniform float b) {
+    typedef float Float[3];
+    float a = aFOO[programIndex];
+    Float x;
+    x[0] = 1;
+    x[1] = a;
+    x[2] = 2;
+    RET[programIndex] = x[b-4];
+}
+
+export void result(uniform float RET[]) { RET[programIndex] = 1+programIndex; }

tests/typedef-4.ispc

@@ -0,0 +1,10 @@
+
+export uniform int width() { return programCount; }
+
+export void f_fu(uniform float RET[], uniform float aFOO[], uniform float b) {
+    typedef float Float;
+    Float a = aFOO[programIndex];
+    RET[programIndex] = a;
+}
+
+export void result(uniform float RET[]) { RET[programIndex] = 1+programIndex; }