Convert raw strings in compiler

lib/compiler/implementation/ssa/codegen.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.
 
 class SsaCodeGeneratorTask extends CompilerTask {
 
   final JavaScriptBackend backend;
 
   SsaCodeGeneratorTask(JavaScriptBackend backend)
       : this.backend = backend,
@@ skipping 1893 matching lines @@
 
   visitThis(HThis node) {
     push(new js.This());
   }
 
   visitThrow(HThrow node) {
     if (node.isRethrow) {
       use(node.inputs[0]);
       pushStatement(new js.Throw(pop()), node);
     } else {
-      generateThrowWithHelper(@'$throw', node.inputs[0]);
+      generateThrowWithHelper(r'$throw', node.inputs[0]);
     }
   }
 
   visitBoundsCheck(HBoundsCheck node) {
     // TODO(ngeoffray): Separate the two checks of the bounds check, so,
     // e.g., the zero checks can be shared if possible.
 
     // If the checks always succeeds, we would have removed the bounds check
     // completely.
     assert(node.staticChecks != HBoundsCheck.ALWAYS_TRUE);
@@ skipping 1069 matching lines @@
   if (leftType.canBeNull() && rightType.canBeNull()) {
     if (left.isConstantNull() || right.isConstantNull() ||
         (leftType.isPrimitive() && leftType == rightType)) {
       return '==';
     }
     return null;
   } else {
     return '===';
   }
 }