ARM: Let the register allocator handle the context register.

src/arm/lithium-codegen-arm.h

Index: src/arm/lithium-codegen-arm.h
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index 4b6b5ca8e36a800f21d9032918371060ff1cd150..3016b451d29f785fed74c144c2332bf36a59195c 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -258,9 +258,11 @@ class LCodeGen V8_FINAL BASE_EMBEDDED {
     CallRuntime(function, num_arguments, instr);
   }
 
+  void LoadContextFromDeferred(LOperand* context);
   void CallRuntimeFromDeferred(Runtime::FunctionId id,
                                int argc,
-                               LInstruction* instr);
+                               LInstruction* instr,
+                               LOperand* context);
 
   enum R1State {
     R1_UNINITIALIZED,