Properly create variables to access outer arguments and function names.

src/scopeinfo.cc

Index: src/scopeinfo.cc
diff --git a/src/scopeinfo.cc b/src/scopeinfo.cc
index e054d7de54f54bf3bf865ff977f5fd3f4a99b270..e06235af76f712d46b2f87d6cd9508badfe3a3ad 100644
--- a/src/scopeinfo.cc
+++ b/src/scopeinfo.cc
@@ -152,19 +152,18 @@ ScopeInfo<Allocator>::ScopeInfo(Scope* scope)
 //
 // - function name
 //
+// - calls eval boolean flag
+//
 // - number of variables in the context object (smi) (= function context
 //   slot index + 1)
 // - list of pairs (name, Var mode) of context-allocated variables (starting
 //   with context slot 0)
-// - NULL (sentinel)
 //
 // - number of parameters (smi)
 // - list of parameter names (starting with parameter 0 first)
-// - NULL (sentinel)
 //
 // - number of variables on the stack (smi)
 // - list of names of stack-allocated variables (starting with stack slot 0)
-// - NULL (sentinel)
 
 // The ScopeInfo representation could be simplified and the ScopeInfo
 // re-implemented (with almost the same interface). Here is a