vector-based ICs did not update type feedback counts correctly.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index 1587f75218f704fa0f653c4413205bf60a480d6c..7e482ee3fa363f42a69dd0f66f236bff274342da 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -2850,13 +2850,14 @@ void LCodeGen::DoLoadGlobalCell(LLoadGlobalCell* instr) {
 template <class T>
 void LCodeGen::EmitVectorLoadICRegisters(T* instr) {
   DCHECK(FLAG_vector_ics);
-  Register vector = ToRegister(instr->temp_vector());
-  DCHECK(vector.is(VectorLoadICDescriptor::VectorRegister()));
-  __ Move(vector, instr->hydrogen()->feedback_vector());
+  Register vector_register = ToRegister(instr->temp_vector());
+  DCHECK(vector_register.is(VectorLoadICDescriptor::VectorRegister()));
+  Handle<TypeFeedbackVector> vector = instr->hydrogen()->feedback_vector();
+  __ Move(vector_register, vector);
   // No need to allocate this register.
   DCHECK(VectorLoadICDescriptor::SlotRegister().is(rax));
-  __ Move(VectorLoadICDescriptor::SlotRegister(),
-          Smi::FromInt(instr->hydrogen()->slot().ToInt()));
+  int index = vector->GetIndex(instr->hydrogen()->slot());
+  __ Move(VectorLoadICDescriptor::SlotRegister(), Smi::FromInt(index));
 }