dart2js cps: Fuse tear-off and call invocation.

tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart

Index: tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart
diff --git a/tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart b/tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart
index 97b53e7460f02aa1a8713190a62d35763909d8eb..f7e747a8462d16a2a68d391d35b1efb7311cf047 100644
--- a/tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart
+++ b/tests/compiler/dart2js/js_backend_cps_ir_closures_test.dart
@@ -106,6 +106,32 @@ r"""
 function() {
   return new V.A_b_closure(this);
 }"""),
+
+  const TestEntry("""
+staticMethod(x) => x;
+main(x) {
+  var tearOff = staticMethod;
+  print(tearOff(123));
+}
+""",
+r"""
+function(x) {
+  P.print(V.staticMethod(123));
+}"""),
+
+  const TestEntry("""
+class Foo {
+  instanceMethod(x) => x;
+}
+main(x) {
+  var tearOff = new Foo().instanceMethod;
+  print(tearOff(123));
+}
+""",
+r"""
+function(x) {
+  P.print(V.Foo$().instanceMethod$1(123));
+}"""),
 ];
 
 void main() {