Do not eliminate instructions that might throw.

sdk/lib/_internal/compiler/implementation/ssa/optimize.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;
 
 abstract class OptimizationPhase {
   String get name;
   void visitGraph(HGraph graph);
 }
@@ skipping 777 matching lines @@
 }
 
 class SsaDeadCodeEliminator extends HGraphVisitor implements OptimizationPhase {
   final HTypeMap types;
   final String name = "SsaDeadCodeEliminator";
 
   SsaDeadCodeEliminator(this.types);
 
   bool isDeadCode(HInstruction instruction) {
     return !instruction.hasSideEffects()
+           && !instruction.canThrow()
            && instruction.usedBy.isEmpty
-           // A dynamic getter that has no side effect can still throw
-           // a NoSuchMethodError.
-           && instruction is !HInvokeDynamicGetter
-           && instruction is !HCheck
            && instruction is !HTypeGuard
            && instruction is !HParameterValue
            && instruction is !HLocalSet
            && !instruction.isControlFlow();
   }
 
   void visitGraph(HGraph graph) {
     visitPostDominatorTree(graph);
   }
 
@@ skipping 628 matching lines @@
             || otherIntercepted.contains(backend.jsDoubleClass)) {
           interceptor.interceptedClasses.addAll(user.interceptedClasses);
         }
         user.interceptedClasses = interceptor.interceptedClasses;
       }
     }
   }
 
   // TODO(ngeoffray): Also implement it for non-intercepted calls.
 }