Put the type feedback vector in the unoptimized JavaScript frame.

src/x64/macro-assembler-x64.cc

 // Copyright 2012 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 5165 matching lines @@
   movp(scratch1, FieldOperand(current, Map::kBitField2Offset));
   DecodeField<Map::ElementsKindBits>(scratch1);
   cmpp(scratch1, Immediate(DICTIONARY_ELEMENTS));
   j(equal, found);
   movp(current, FieldOperand(current, Map::kPrototypeOffset));
   CompareRoot(current, Heap::kNullValueRootIndex);
   j(not_equal, &loop_again);
 }
 
 
+void MacroAssembler::OSRDropVectorFromStack(int unoptimized_slot_count,
+                                            Register scratch0,
+                                            Register scratch1) {
+  if (unoptimized_slot_count > 0) {
+    Label loop_start;
+    leap(scratch0,
+         Operand(rbp, JavaScriptFrameConstants::kFeedbackVectorOffset));
+    bind(&loop_start);
+    movp(scratch1, Operand(scratch0, -1 * kPointerSize));
+    movp(Operand(scratch0, 0), scratch1);
+    subp(scratch0, Immediate(kPointerSize));
+    cmpp(scratch0, rsp);
+    j(greater, &loop_start);
+  }
+  addp(rsp, Immediate(kPointerSize));
+}
+
+
 void MacroAssembler::TruncatingDiv(Register dividend, int32_t divisor) {
   DCHECK(!dividend.is(rax));
   DCHECK(!dividend.is(rdx));
   base::MagicNumbersForDivision<uint32_t> mag =
       base::SignedDivisionByConstant(static_cast<uint32_t>(divisor));
   movl(rax, Immediate(mag.multiplier));
   imull(dividend);
   bool neg = (mag.multiplier & (static_cast<uint32_t>(1) << 31)) != 0;
   if (divisor > 0 && neg) addl(rdx, dividend);
   if (divisor < 0 && !neg && mag.multiplier > 0) subl(rdx, dividend);
   if (mag.shift > 0) sarl(rdx, Immediate(mag.shift));
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64