[es6] Tail calls support.

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
diff --git a/src/x64/macro-assembler-x64.cc b/src/x64/macro-assembler-x64.cc
index b31328bc7a58b1ee82d6ce8198b8d15757410290..7e4a87537a94c9c69cf85345474666fb6acd8b28 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -5072,7 +5072,7 @@ void MacroAssembler::CopyBytes(Register destination,
     incp(source);
     incp(destination);
     decl(length);
-    j(not_zero, &short_loop);
+    j(not_zero, &short_loop, Label::kNear);
   }
 
   bind(&done);
@@ -5083,13 +5083,13 @@ void MacroAssembler::InitializeFieldsWithFiller(Register current_address,
                                                 Register end_address,
                                                 Register filler) {
   Label loop, entry;
-  jmp(&entry);
+  jmp(&entry, Label::kNear);
   bind(&loop);
   movp(Operand(current_address, 0), filler);
   addp(current_address, Immediate(kPointerSize));
   bind(&entry);
   cmpp(current_address, end_address);
-  j(below, &loop);
+  j(below, &loop, Label::kNear);
 }