dart2js cps: Share interceptors by default and propagate to use later.

tests/compiler/dart2js/js_backend_cps_ir_basic_test.dart

Index: tests/compiler/dart2js/js_backend_cps_ir_basic_test.dart
diff --git a/tests/compiler/dart2js/js_backend_cps_ir_basic_test.dart b/tests/compiler/dart2js/js_backend_cps_ir_basic_test.dart
index 8ba0f45bcd0978a00420050cfcb4b9dd19f496d6..6873d05307f66879e4c39d2cb6bd5d0662aa36c2 100644
--- a/tests/compiler/dart2js/js_backend_cps_ir_basic_test.dart
+++ b/tests/compiler/dart2js/js_backend_cps_ir_basic_test.dart
@@ -25,15 +25,14 @@ main() {
   print('($m)');
 }""",r"""
 function() {
-  var l = [1, 2, 3], m = P.LinkedHashMap_LinkedHashMap$_literal(["s", 1]);
   P.print("()");
   P.print("(true)");
   P.print("(1)");
   P.print("(" + H.S([1, 2, 3]) + ")");
   P.print("(" + H.S(P.LinkedHashMap_LinkedHashMap$_literal(["s", 1])) + ")");
   P.print("(1)");
-  P.print("(" + H.S(l) + ")");
-  P.print("(" + H.S(m) + ")");
+  P.print("(" + H.S([1, 2, 3]) + ")");
+  P.print("(" + H.S(P.LinkedHashMap_LinkedHashMap$_literal(["s", 1])) + ")");
 }"""),
   const TestEntry("""
 foo(a, [b = "b"]) => b;