Fix a bug related to bailout where an instruction would be generate at use site for a HBailoutTarge…

frog/leg/ssa/codegen_helpers.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.
 
 /**
  * Instead of emitting each SSA instruction with a temporary variable
  * mark instructions that can be emitted at their use-site.
  * For example, in:
  *   t0 = 4;
  *   t1 = 3;
@@ skipping 20 matching lines @@
       if (!input.generateAtUseSite() && input.usedBy.length == 1) {
         expectedInputs.add(input);
       }
     }
   }
 
   // The codegen might use the input multiple times, so it must not be
   // set generate at use site.
   void visitIs(HIs instruction) {}
 
+  // A bailout target does not use its input like the other
+  // instructions. Its inputs must be emitted prior to visiting it.
+  void visitBailoutTarget(HBailoutTarget instruction) {}
+
   void visitBasicBlock(HBasicBlock block) {
     // Visit each instruction of the basic block in last-to-first order.
     // Keep a list of expected inputs of the current "expression" being
     // merged. If instructions occur in the expected order, they are
     // included in the expression.
 
     // The expectedInputs list holds non-trivial instructions that may
     // be generated at their use site, if they occur in the correct order.
     expectedInputs = new List<HInstruction>();
     // Add non-trivial inputs of instruction to expectedInputs, in
@@ skipping 287 matching lines @@
   };
 }
 
 class JSBinaryOperatorPrecedence {
   final int left;
   final int right;
   const JSBinaryOperatorPrecedence(this.left, this.right);
   // All binary operators (excluding assignment) are left associative.
   int get precedence() => left;
 }