[es8] Remove syntactic tail calls support.

test/mjsunit/es8/syntactic-tail-call-simple.js

Index: test/mjsunit/es8/syntactic-tail-call-simple.js
diff --git a/test/mjsunit/es8/syntactic-tail-call-simple.js b/test/mjsunit/es8/syntactic-tail-call-simple.js
deleted file mode 100644
index ec7ade6673bee066a4c7ddf377e03f8b412acf9f..0000000000000000000000000000000000000000
--- a/test/mjsunit/es8/syntactic-tail-call-simple.js
+++ /dev/null
@@ -1,143 +0,0 @@
-// Copyright 2016 the V8 project authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Flags: --allow-natives-syntax --harmony-explicit-tailcalls --stack-size=100
-
-//
-// Tail calls work only in strict mode.
-//
-(function() {
-  function f(n) {
-    if (n <= 0) {
-      return "foo";
-    }
-    return f(n - 1);
-  }
-  assertThrows(()=>{ f(1e5) });
-  %OptimizeFunctionOnNextCall(f);
-  assertThrows(()=>{ f(1e5) });
-})();
-
-
-//
-// Tail call normal functions.
-//
-(function() {
-  "use strict";
-  function f(n) {
-    if (n <= 0) {
-      return "foo";
-    }
-    return continue f(n - 1);
-  }
-  assertEquals("foo", f(1e5));
-  %OptimizeFunctionOnNextCall(f);
-  assertEquals("foo", f(1e5));
-})();
-
-
-(function() {
-  "use strict";
-  function f(n) {
-    if (n <= 0) {
-      return  "foo";
-    }
-    return continue 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";
-    }
-    return continue g(n - 1);
-  }
-  function g(n){
-    if (n <= 0) {
-      return "bar";
-    }
-    return continue f(n - 1);
-  }
-  assertEquals("foo", f(1e5));
-  assertEquals("bar", f(1e5 + 1));
-  %OptimizeFunctionOnNextCall(f);
-  assertEquals("foo", f(1e5));
-  assertEquals("bar", f(1e5 + 1));
-})();
-
-
-(function() {
-  "use strict";
-  function f(n){
-    if (n <= 0) {
-      return "foo";
-    }
-    return continue g(n - 1, 42);  // Call with arguments adaptor.
-  }
-  function g(n){
-    if (n <= 0) {
-      return "bar";
-    }
-    return continue 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.
-//
-(function() {
-  "use strict";
-  function f0(n) {
-    if (n <= 0) {
-      return "foo";
-    }
-    return continue f_bound(n - 1);
-  }
-  var f_bound = f0.bind({});
-  function f(n) {
-    return continue f_bound(n);
-  }
-  assertEquals("foo", f(1e5));
-  %OptimizeFunctionOnNextCall(f);
-  assertEquals("foo", f(1e5));
-})();
-
-
-(function() {
-  "use strict";
-  function f0(n){
-    if (n <= 0) {
-      return "foo";
-    }
-    return continue g_bound(n - 1);
-  }
-  function g0(n){
-    if (n <= 0) {
-      return "bar";
-    }
-    return continue f_bound(n - 1);
-  }
-  var f_bound = f0.bind({});
-  var g_bound = g0.bind({});
-  function f(n) {
-    return continue f_bound(n);
-  }
-  assertEquals("foo", f(1e5));
-  assertEquals("bar", f(1e5 + 1));
-  %OptimizeFunctionOnNextCall(f);
-  assertEquals("foo", f(1e5));
-  assertEquals("bar", f(1e5 + 1));
-})();