Add initial tests for Kernel interpreter

pkg/kernel/testcases/interpreter/static_invocation_test.dart

+library static_invocation_test;
+
+void main() {
+  a();
+  b(1, 9);
+  print(b(1, 9));
+  var retD = d();
+  print(c(37));
+  print(retD);
+}
+
+void a() {}
+
+void b(int n, int m) {
+  print(n);
+  print(m);
+  print(n + m);
+}
+
+String c(int n) {
+  print('c:$n');
+  return "d:${d()}";
+}
+
+int d() {
+  a();
+  return 37;
+}