Change IllegalArgumentException to ArgumentError.

lib/compiler/implementation/ssa/nodes.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 abstract class HVisitor<R> {
   R visitAdd(HAdd node);
   R visitBailoutTarget(HBailoutTarget node);
   R visitBitAnd(HBitAnd node);
   R visitBitNot(HBitNot node);
   R visitBitOr(HBitOr node);
@@ skipping 1605 matching lines @@
     // are numbers. If we don't know the outgoing type we try to make it a
     // number.
     if (propagatedType.isUnknown() || propagatedType.isNumber()) {
       return HType.NUMBER;
     }
     // Even if the desired outgoing type is not a number we still want the
     // second argument to be a number if the first one is a number. This will
     // not help for the outgoing type, but at least the binary arithmetic
     // operation will not have type problems.
     // TODO(floitsch): normally we shouldn't request a number, but simply
-    // throw an IllegalArgumentException if it isn't. This would be similar
+    // throw an ArgumentError if it isn't. This would be similar
     // to the array case.
     if (input == right && left.isNumber(types)) return HType.NUMBER;
     return HType.UNKNOWN;
   }
 
   HType computeLikelyType(HTypeMap types) {
     if (left.isTypeUnknown(types)) return HType.NUMBER;
     return HType.UNKNOWN;
   }
 
@@ skipping 1267 matching lines @@
   HBasicBlock get start => expression.start;
   HBasicBlock get end {
     // We don't create a switch block if there are no cases.
     assert(!statements.isEmpty());
     return statements.last().end;
   }
 
   bool accept(HStatementInformationVisitor visitor) =>
       visitor.visitSwitchInfo(this);
 }