StubCallInterfaceDescriptor takes a context register.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index c408288363376ab956e27867cf0d8ddb2254d44c..cb2839ec84b5f62ce48d15b01b331cf988351a5b 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -1125,14 +1125,20 @@ LInstruction* LChunkBuilder::DoCallJSFunction(
 
 LInstruction* LChunkBuilder::DoCallWithDescriptor(
     HCallWithDescriptor* instr) {
-  const CallInterfaceDescriptor* descriptor = instr->descriptor();
-
-  LOperand* target = UseRegisterOrConstantAtStart(instr->target());
+  const InterfaceDescriptor* descriptor = instr->descriptor();
   ZoneList<LOperand*> ops(instr->OperandCount(), zone());
+  LOperand* target = UseRegisterOrConstantAtStart(instr->target());
   ops.Add(target, zone());
-  for (int i = 1; i < instr->OperandCount(); i++) {
+
+  if (descriptor->needs_context_register()) {
+    LOperand* context = UseFixed(instr->context(), esi);
+    ops.Add(context, zone());
+  }
+
+  int first_descriptor_index = instr->FirstDescriptorOperandIndex();
+  for (int i = first_descriptor_index; i < instr->OperandCount(); i++) {
     LOperand* op = UseFixed(instr->OperandAt(i),
-        descriptor->GetParameterRegister(i - 1));
+        descriptor->GetParameterRegister(i - first_descriptor_index));
     ops.Add(op, zone());
   }