Add some new tests

One tricky pointer one currently hits an assertion (fix forthcoming).

tests/nested-statics.ispc

@@ -0,0 +1,16 @@
+
+export uniform int width() { return programCount; }
+
+
+export void f_f(uniform float RET[], uniform float aFOO[]) {
+    static int a = 1234;
+    {
+        static int a = 0;
+        ++a;
+        RET[programIndex] = a;
+    }
+}
+
+export void result(uniform float RET[]) {
+    RET[programIndex] = 1;
+}