StubCallInterfaceDescriptor takes a context register.

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
index 3d7f72b9e22c4c1252f2d6be72908b8250231669..095640d86aeb17e2a01f4d1c2bde8850c467ad90 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -1850,18 +1850,18 @@ class LCallJSFunction V8_FINAL : public LTemplateInstruction<1, 1, 0> {
 
 class LCallWithDescriptor V8_FINAL : public LTemplateResultInstruction<1> {
  public:
-  LCallWithDescriptor(const CallInterfaceDescriptor* descriptor,
+  LCallWithDescriptor(const InterfaceDescriptor* descriptor,
                       const ZoneList<LOperand*>& operands,
                       Zone* zone)
     : descriptor_(descriptor),
-      inputs_(descriptor->environment_length() + 1, zone) {
-    ASSERT(descriptor->environment_length() + 1 == operands.length());
+      inputs_(descriptor->GetRegisterParameterCount() + 1, zone) {
+    ASSERT(descriptor->GetRegisterParameterCount() + 1 == operands.length());
     inputs_.AddAll(operands, zone);
   }
 
   LOperand* target() const { return inputs_[0]; }
 
-  const CallInterfaceDescriptor* descriptor() { return descriptor_; }
+  const InterfaceDescriptor* descriptor() { return descriptor_; }
 
  private:
   DECLARE_CONCRETE_INSTRUCTION(CallWithDescriptor, "call-with-descriptor")
@@ -1871,7 +1871,7 @@ class LCallWithDescriptor V8_FINAL : public LTemplateResultInstruction<1> {
 
   int arity() const { return hydrogen()->argument_count() - 1; }
 
-  const CallInterfaceDescriptor* descriptor_;
+  const InterfaceDescriptor* descriptor_;
   ZoneList<LOperand*> inputs_;
 
   // Iterator support.