Use a different map to distinguish eval contexts

src/interface-descriptors.h

Index: src/interface-descriptors.h
diff --git a/src/interface-descriptors.h b/src/interface-descriptors.h
index b376df1dbb1f1ac7e1d6166a4f71160f7ea62d9e..ea7bd5e92ba6491d918e3887d109c9c0601c022d 100644
--- a/src/interface-descriptors.h
+++ b/src/interface-descriptors.h
@@ -30,6 +30,7 @@ class PlatformInterfaceDescriptor;
   V(VarArgFunction)                       \
   V(FastNewClosure)                       \
   V(FastNewFunctionContext)               \
+  V(FastNewEvalContext)                   \
   V(FastNewObject)                        \
   V(FastNewRestParameter)                 \
   V(FastNewSloppyArguments)               \
@@ -415,6 +416,16 @@ class FastNewFunctionContextDescriptor : public CallInterfaceDescriptor {
   static const Register SlotsRegister();
 };
 
+class FastNewEvalContextDescriptor : public CallInterfaceDescriptor {
+ public:
+  DEFINE_PARAMETERS(kFunction, kSlots)
+  DECLARE_DESCRIPTOR_WITH_CUSTOM_FUNCTION_TYPE(FastNewEvalContextDescriptor,
+                                               CallInterfaceDescriptor)
+
+  static const Register FunctionRegister();
+  static const Register SlotsRegister();
+};
+
 class FastNewObjectDescriptor : public CallInterfaceDescriptor {
  public:
   DECLARE_DESCRIPTOR(FastNewObjectDescriptor, CallInterfaceDescriptor)