Put the type feedback vector in the unoptimized JavaScript frame.

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 973bbd1ef06bb794d153701c380eeae63b2c4057..3387813bf6df589b3ab08d6862ca43086f4246f8 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -1207,8 +1207,13 @@ void CodeGenerator::AssemblePrologue() {
     // remaining stack slots.
     if (FLAG_code_comments) __ RecordComment("-- OSR entrypoint --");
     osr_pc_offset_ = __ pc_offset();
-    DCHECK(stack_slots >= frame()->GetOsrStackSlotCount());
-    stack_slots -= frame()->GetOsrStackSlotCount();
+    int osr_stack_slot_count = frame()->GetOsrStackSlotCount();
+    DCHECK(stack_slots >= osr_stack_slot_count);
+    stack_slots -= osr_stack_slot_count;
+
+    // Full-code javascript functions have a type feedback vector in the frame.
+    // Shift any locals down one slot, and adjust the stack pointer.
+    __ OSRDropVectorFromStack(osr_stack_slot_count, rbx, rax);
   }
 
   if (stack_slots > 0) {