[Interpreter] Add support for Load / Store to Lookup slots.

src/compiler/interpreter-assembler.h

Index: src/compiler/interpreter-assembler.h
diff --git a/src/compiler/interpreter-assembler.h b/src/compiler/interpreter-assembler.h
index 11e3a9127c72fd1afc1aac367559a2fdac51ac57..f6878c0361223868fcc285338c6167981681642b 100644
--- a/src/compiler/interpreter-assembler.h
+++ b/src/compiler/interpreter-assembler.h
@@ -102,6 +102,9 @@ class InterpreterAssembler {
   // Load the TypeFeedbackVector for the current function.
   Node* LoadTypeFeedbackVector();
 
+  // Project the output value at index |index|
+  Node* Projection(int index, Node* node);
+
   // Call constructor |constructor| with |arg_count| arguments (not
   // including receiver) and the first argument located at
   // |first_arg|. The |new_target| is the same as the