[es8] Initial set of changes to support syntactic tail calls.

test/message/syntactic-tail-call-in-try-try-catch-finally.js

Index: test/message/syntactic-tail-call-in-try-try-catch-finally.js
diff --git a/test/mjsunit/regress/regress-crbug-603463.js b/test/message/syntactic-tail-call-in-try-try-catch-finally.js
similarity index 52%
copy from test/mjsunit/regress/regress-crbug-603463.js
copy to test/message/syntactic-tail-call-in-try-try-catch-finally.js
index 20bfae65c54fa744d2470903fc92749f99726d67..202f4cc2bb4f369993ec235f6eb07f0229ac019c 100644
--- a/test/mjsunit/regress/regress-crbug-603463.js
+++ b/test/message/syntactic-tail-call-in-try-try-catch-finally.js
@@ -2,15 +2,20 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-function load(a, i) {
-  return a[i];
-}
+// Flags: --harmony-explicit-tailcalls
 
 function f() {
-  return load(new Proxy({}, {}), undefined);
+  return 1;
 }
 
-f();
-f();
-load([11, 22, 33], 0);
-f();
+function g() {
+  try {
+    try {
+      f();
+    } catch(e) {
+      return continue f();
+    }
+  } finally {
+    f();
+  }
+}