HLSL: Implement member functions calling member functions.

Test/hlsl.memberFunCall.frag

@@ -0,0 +1,16 @@
+float method3(float a) { return 1.0; }
+
+struct myContext {
+    float method1() { return method2(); }
+    float method2() { return method3(1.0); }
+    float method3(float a) { return method4(a, a); }
+    float method4(float a, float b) { return a + b + f; }
+    float f;
+};
+
+float4 main() : SV_TARGET0
+{
+    myContext context;
+    context.f = 3.0;
+    return (float4)context.method1();
+}