Removed unused dartc 'disable-type-optimization' command line flag

compiler/java/com/google/dart/compiler/CommandLineOptions.java

Index: compiler/java/com/google/dart/compiler/CommandLineOptions.java
diff --git a/compiler/java/com/google/dart/compiler/CommandLineOptions.java b/compiler/java/com/google/dart/compiler/CommandLineOptions.java
index 5ebd4d509e2abf28f83f396fd9e911fb70d6a95d..3cf9695c2798dc1a0cc6ca1f22e4b1c692b2581d 100644
--- a/compiler/java/com/google/dart/compiler/CommandLineOptions.java
+++ b/compiler/java/com/google/dart/compiler/CommandLineOptions.java
@@ -41,10 +41,6 @@ public class CommandLineOptions {
         usage = "Generate runtime type checks")
     private boolean developerModeChecks = false;
 
-    @Option(name = "--disable-type-optimizations",
-        usage = "Turn off type optimizations\n (for debugging)")
-    private boolean disableTypeOptimizations = false;
-
     @Option(name = "--ignore-unrecognized-flags",
         usage = "Ignore unrecognized command line flags")
     private boolean ignoreUnrecognizedFlags = false;
@@ -171,10 +167,6 @@ public class CommandLineOptions {
       return batch;
     }
 
-    public boolean disableTypeOptimizations() {
-      return disableTypeOptimizations;
-    }
-
     /**
      * Returns <code>true</code> if the compiler should print it's help message.
      */