Unify internal and external typed arrays a bit

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 b095119a53643c08010d91a4af50b7dfb5a6d6d8..e70bebd938043890832a5bb106bca22fbf64ef06 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -5165,15 +5165,11 @@ void LCodeGen::DoCheckArrayBufferNotNeutered(
     LCheckArrayBufferNotNeutered* instr) {
   Register view = ToRegister(instr->view());
 
-  Label has_no_buffer;
   __ movp(kScratchRegister,
           FieldOperand(view, JSArrayBufferView::kBufferOffset));
-  __ JumpIfSmi(kScratchRegister, &has_no_buffer);
   __ testb(FieldOperand(kScratchRegister, JSArrayBuffer::kBitFieldOffset),
            Immediate(1 << JSArrayBuffer::WasNeutered::kShift));
   DeoptimizeIf(not_zero, instr, Deoptimizer::kOutOfBounds);
-
-  __ bind(&has_no_buffer);
 }