Native context: alpha sort slots and remove boilerplate.

src/runtime.js

Index: src/runtime.js
diff --git a/src/runtime.js b/src/runtime.js
index e2e6d2ef351216f0f0a13c99d9c50dd1a562dbfc..de64541496f41ac4ce59cc7836943588804a0acb 100644
--- a/src/runtime.js
+++ b/src/runtime.js
@@ -915,10 +915,10 @@ $toString = ToString;
 });
 
 utils.ExportToRuntime(function(to) {
-  to.ToNumber = ToNumber;
-  to.ToString = ToString;
-  to.ToInteger = ToInteger;
-  to.ToLength = ToLength;
+  to["to_integer_fun"] = ToInteger;
+  to["to_length_fun"] = ToLength;
+  to["to_number_fun"] = ToNumber;
+  to["to_string_fun"] = ToString;
 });
 
 utils.Export(function(to) {