Make List.from default to not growable.

sdk/lib/_internal/compiler/implementation/ssa/bailout.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.
 
 part of ssa;
 
 class BailoutInfo {
   int instructionId;
   int bailoutId;
   BailoutInfo(this.instructionId, this.bailoutId);
 }
 
 /**
  * Keeps track of the execution environment for instructions. An
  * execution environment contains the SSA instructions that are live.
  */
 class Environment {
   final Set<HInstruction> lives;
   final List<HBasicBlock> loopMarkers;
   Environment() : lives = new Set<HInstruction>(),
                   loopMarkers = new List<HBasicBlock>();
   Environment.from(Environment other)
     : lives = new Set<HInstruction>.from(other.lives),
-      loopMarkers = new List<HBasicBlock>.from(other.loopMarkers);
+      loopMarkers = new List<HBasicBlock>.from(other.loopMarkers,
+                                               growable: true);
 
   void remove(HInstruction instruction) {
     lives.remove(instruction);
   }
 
   void add(HInstruction instruction) {
     // If the instruction is a check, we add its checked input
     // instead. This allows sharing the same environment between
     // different type guards.
     //
@@ skipping 590 matching lines @@
         hasComplexBailoutTargets = true;
       }
     } else {
       hasComplexBailoutTargets = true;
       blocks.forEach((HBasicBlock block) {
         block.bailoutTargets.add(target);
       });
     }
   }
 }