Semantics-preserving control-flow tweaks to fix switch warnings

Eclipse was warning that these `switch` statements had no `default`
cases.  Each did have some default behavior, but implemented outside
the `switch`.  By moving the default behavior into a `default` case
within the `switch`, we eliminate a static warning with no change
whatsoever to the run-time behavior.

com.ibm.wala.cast.js.rhino/source/com/ibm/wala/cast/js/translator/RhinoToAstTranslator.java

@@ -1185,8 +1185,9 @@ public class RhinoToAstTranslator implements TranslatorToCAst {
     case Token.DEBUGGER: {
       return Ast.makeConstant(null);
     }
+    default:
+      throw new RuntimeException("unexpected keyword literal " + node + " (" + node.getType() +")");
 		}
-		throw new RuntimeException("unexpected keyword literal " + node + " (" + node.getType() +")");
 	}
 
 	@Override

com.ibm.wala.dalvik/src/com/ibm/wala/dalvik/dex/instructions/BinaryLiteralOperation.java

@@ -169,8 +169,9 @@ public class BinaryLiteralOperation extends Instruction {
             return IBinaryOpInstruction.Operator.DIV;
         case REM_DOUBLE:
             return IBinaryOpInstruction.Operator.REM;
+		default:
+			return null;
         }
-        return null;
     }
 
     public boolean isFloat()

com.ibm.wala.dalvik/src/com/ibm/wala/dalvik/dex/instructions/BinaryOperation.java

@@ -166,8 +166,9 @@ public class BinaryOperation extends Instruction {
             return IBinaryOpInstruction.Operator.DIV;
         case REM_DOUBLE:
             return IBinaryOpInstruction.Operator.REM;
+		default:
+	        return null;
         }
-        return null;
     }
     public boolean isFloat()
     {

com.ibm.wala.shrike/src/com/ibm/wala/shrike/copywriter/CopyWriter.java

@@ -262,8 +262,9 @@ public class CopyWriter {
       return w.addCPDouble(cp.getCPDouble(i));
     case ClassConstants.CONSTANT_Utf8:
       return w.addCPUtf8(cp.getCPUtf8(i));
+    default:
+      return -1;
     }
-    return -1;
   }
 
   private void doClass(final ClassInstrumenter ci) throws Exception {