[builtins] Unify the various versions of [[Call]] with a Call builtin.

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 c67d955a897e4dfc67623626f334f02f3b92f279..59482bea135bd42b6603ae474d72fa6abdf15997 100644
--- a/src/x64/macro-assembler-x64.cc
+++ b/src/x64/macro-assembler-x64.cc
@@ -3394,6 +3394,18 @@ void MacroAssembler::AssertName(Register object) {
 }
 
 
+void MacroAssembler::AssertFunction(Register object) {
+  if (emit_debug_code()) {
+    testb(object, Immediate(kSmiTagMask));
+    Check(not_equal, kOperandIsASmiAndNotAFunction);
+    Push(object);
+    CmpObjectType(object, JS_FUNCTION_TYPE, object);
+    Pop(object);
+    Check(not_equal, kOperandIsNotAFunction);
+  }
+}
+
+
 void MacroAssembler::AssertUndefinedOrAllocationSite(Register object) {
   if (emit_debug_code()) {
     Label done_checking;
@@ -4543,6 +4555,12 @@ void MacroAssembler::LoadContext(Register dst, int context_chain_length) {
 }
 
 
+void MacroAssembler::LoadGlobalProxy(Register dst) {
+  movp(dst, GlobalObjectOperand());
+  movp(dst, FieldOperand(dst, GlobalObject::kGlobalProxyOffset));
+}
+
+
 void MacroAssembler::LoadTransitionedArrayMapConditional(
     ElementsKind expected_kind,
     ElementsKind transitioned_kind,