Partial revert of rest parameter desugaring.

src/full-codegen/arm64/full-codegen-arm64.cc

Index: src/full-codegen/arm64/full-codegen-arm64.cc
diff --git a/src/full-codegen/arm64/full-codegen-arm64.cc b/src/full-codegen/arm64/full-codegen-arm64.cc
index 1ac0596001c802b0e82e7f2abacde1a912de886d..fede21f48fe8e2d129d4b1929f0f2bc91045d8f5 100644
--- a/src/full-codegen/arm64/full-codegen-arm64.cc
+++ b/src/full-codegen/arm64/full-codegen-arm64.cc
@@ -262,6 +262,28 @@ void FullCodeGenerator::Generate() {
     SetVar(new_target_var, x3, x0, x2);
   }
 
+  // Possibly allocate RestParameters
+  int rest_index;
+  Variable* rest_param = scope()->rest_parameter(&rest_index);
+  if (rest_param) {
+    Comment cmnt(masm_, "[ Allocate rest parameter array");
+
+    int num_parameters = info->scope()->num_parameters();
+    int offset = num_parameters * kPointerSize;
+
+    __ Add(x3, fp, StandardFrameConstants::kCallerSPOffset + offset);
+    __ Mov(x2, Smi::FromInt(num_parameters));
+    __ Mov(x1, Smi::FromInt(rest_index));
+    __ Mov(x0, Smi::FromInt(language_mode()));
+    __ Push(x3, x2, x1, x0);
+    function_in_register_x1 = false;
+
+    RestParamAccessStub stub(isolate());
+    __ CallStub(&stub);
+
+    SetVar(rest_param, x0, x1, x2);
+  }
+
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Function uses arguments object.