Add HArrayBufferNotNeutered instruction

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 7c1668f1fa11a0334beb6891e91582a365ab7615..b095119a53643c08010d91a4af50b7dfb5a6d6d8 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -5161,6 +5161,22 @@ void LCodeGen::DoCheckNonSmi(LCheckNonSmi* instr) {
 }
 
 
+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);

[Sven Panne, 2015/04/28 13:45:16]

Would it be worth introducing a new deopt message instead of kOutOfBounds? As it
is, things might be confusing for users...

+
+  __ bind(&has_no_buffer);
+}
+
+
 void LCodeGen::DoCheckInstanceType(LCheckInstanceType* instr) {
   Register input = ToRegister(instr->value());