dart2js cps: Emit 'return' after throwing call to assist VM analysis.

tests/compiler/dart2js/js_backend_cps_ir_gvn_test.dart

Index: tests/compiler/dart2js/js_backend_cps_ir_gvn_test.dart
diff --git a/tests/compiler/dart2js/js_backend_cps_ir_gvn_test.dart b/tests/compiler/dart2js/js_backend_cps_ir_gvn_test.dart
index 5bfb430e70f730986a48dd5aab8db9d80c2a2419..873afa8fe6364a7487ea095e0cf5f38fe95d00ae 100644
--- a/tests/compiler/dart2js/js_backend_cps_ir_gvn_test.dart
+++ b/tests/compiler/dart2js/js_backend_cps_ir_gvn_test.dart
@@ -54,7 +54,7 @@ function(x, list) {
   var v0 = x.left, a = v0.left, b = v0.right, sum = 0, k = 0, c = (v0 = x.right).left, d = v0.right, i = a.value + c.value, v1 = list[v0 = i * (b.value + d.value)];
   for (; k < 10; sum = sum + (v1 + i), k = k + 1)
     if (v0 < 0 || v0 >= 10)
-      H.ioore(list, v0);
+      return H.ioore(list, v0);
   return sum;
 }"""),
 ];