Simplify equality checks and get rid of unreachable code in number and bool.

compiler/lib/implementation/core.js

Index: compiler/lib/implementation/core.js
diff --git a/compiler/lib/implementation/core.js b/compiler/lib/implementation/core.js
index 3ac10f35b3b2872d27cb5d9097127e97eba596dc..6240556c9a685fdae5344247bb04b21be48ba6da 100644
--- a/compiler/lib/implementation/core.js
+++ b/compiler/lib/implementation/core.js
@@ -252,7 +252,6 @@ function assert(expr) {
   }
 }
 
-// TODO(jimhug): Remove these functions after updating compiler backend.
 function BIT_OR$operator(val1, val2) {
   return (typeof(val1) == 'number' && typeof(val2) == 'number')
       ? val1 | val2
@@ -334,6 +333,18 @@ function negate$operator(val) {
   return (typeof(val) == 'number') ? -val : val.negate$operator();
 }
 
+function EQ$operator(val1, val2) {
+  return (typeof val1 != 'object')

[floitsch, 2012/01/19 11:31:59]

what if val1 is a native string and val2 is a boxed string?

[kasperl, 2012/01/19 11:43:04]

Good point. This code behaves the same (broken) way as the old code and always
return false in this case. It seems that I've only fixed the case where you're
comparing two wrappers.

+      ? val1 === val2
+      : val1.EQ$operator(val2);
+}
+
+function NE$operator(val1, val2) {
+  return (typeof val1 != 'object')

[floitsch, 2012/01/19 11:31:59]

ditto.

+      ? val1 !== val2
+      : !val1.EQ$operator(val2);
+}
+
 function LT$operator(val1, val2) {
   return (typeof(val1) == 'number' && typeof(val2) == 'number')
       ? val1 < val2
@@ -358,25 +369,6 @@ function GTE$operator(val1, val2) {
       : val1.GTE$operator(val2);
 }
 
-
-/**
- * These operators need to work correctly with undefined
- * so must be functions.
- */
-function EQ$operator(val1, val2) {
-  if (val1 === $Dart$Null) {
-    return val2 === $Dart$Null;
-  } else if (typeof(val1) == typeof(val2) && typeof val1 != 'object') {
-    // number, boolean, string
-    return val1 === val2;
-  }
-  return val1.EQ$operator(val2);
-}
-
-function NE$operator(val1, val2) {
-  return !EQ$operator(val1, val2);
-}
-
 // The following operator-functions are not called from Dart-generated code, but
 // only from handwritten JS code.
 function INDEX$operator(obj, index) {