Fix calls of strict mode function with an implicit receiver.

src/code-stubs.h

Index: src/code-stubs.h
diff --git a/src/code-stubs.h b/src/code-stubs.h
index f16a8db82598446ad057d0825cd4850c65a7e3eb..f7a823591b8e52f28d8760fba94d6d2a70594f36 100644
--- a/src/code-stubs.h
+++ b/src/code-stubs.h
@@ -730,8 +730,8 @@ class CallFunctionStub: public CodeStub {
 
   // Minor key encoding in 32 bits with Bitfield <Type, shift, size>.
   class InLoopBits: public BitField<InLoopFlag, 0, 1> {};
-  class FlagBits: public BitField<CallFunctionFlags, 1, 1> {};
-  class ArgcBits: public BitField<int, 2, 32 - 2> {};
+  class FlagBits: public BitField<CallFunctionFlags, 1, 2> {};
+  class ArgcBits: public BitField<int, 3, 32 - 3> {};
 
   Major MajorKey() { return CallFunction; }
   int MinorKey() {
@@ -742,9 +742,14 @@ class CallFunctionStub: public CodeStub {
   }
 
   InLoopFlag InLoop() { return in_loop_; }
+
   bool ReceiverMightBeValue() {
     return (flags_ & RECEIVER_MIGHT_BE_VALUE) != 0;
   }
+
+  bool NonValueReceiverMightBeImplicit() {
+    return (flags_ & NON_VALUE_RECEIVER_MIGHT_BE_IMPLICIT) != 0;
+  }
 };