[crankshaft] Support ES6 tail call elimination.

test/mjsunit/es6/tail-call-simple.js

Index: test/mjsunit/es6/tail-call-simple.js
diff --git a/test/mjsunit/es6/tail-call-simple.js b/test/mjsunit/es6/tail-call-simple.js
index d2890b0212d92044dd0099cdd4f24859d505dc98..5e4025bc5a20206bd651e3253ecda3f571af4154 100644
--- a/test/mjsunit/es6/tail-call-simple.js
+++ b/test/mjsunit/es6/tail-call-simple.js
@@ -3,6 +3,8 @@
 // found in the LICENSE file.
 
 // Flags: --allow-natives-syntax --harmony-tailcalls --stack-size=100
+// TODO(v8:4698), TODO(ishell): support these cases.
+// Flags: --no-turbo --nostress-opt
 
 //
 // Tail calls work only in strict mode.
@@ -10,7 +12,7 @@
 (function() {
   function f(n) {
     if (n <= 0) {
-      return  "foo";
+      return "foo";
     }
     return f(n - 1);
   }
@@ -27,7 +29,7 @@
   "use strict";
   function f(n) {
     if (n <= 0) {
-      return  "foo";
+      return "foo";
     }
     return f(n - 1);
   }
@@ -39,6 +41,20 @@
 
 (function() {
   "use strict";
+  function f(n) {
+    if (n <= 0) {
+      return  "foo";
+    }
+    return f(n - 1, 42);  // Call with arguments adaptor.
+  }
+  assertEquals("foo", f(1e5));
+  %OptimizeFunctionOnNextCall(f);
+  assertEquals("foo", f(1e5));
+})();
+
+
+(function() {
+  "use strict";
   function f(n){
     if (n <= 0) {
       return "foo";
@@ -59,6 +75,28 @@
 })();
 
 
+(function() {
+  "use strict";
+  function f(n){
+    if (n <= 0) {
+      return "foo";
+    }
+    return g(n - 1, 42);  // Call with arguments adaptor.
+  }
+  function g(n){
+    if (n <= 0) {
+      return "bar";
+    }
+    return f(n - 1, 42);  // Call with arguments adaptor.
+  }
+  assertEquals("foo", f(1e5));
+  assertEquals("bar", f(1e5 + 1));
+  %OptimizeFunctionOnNextCall(f);
+  assertEquals("foo", f(1e5));
+  assertEquals("bar", f(1e5 + 1));
+})();
+
+
 //
 // Tail call bound functions.
 //