Transitively mark inputs as live when they are generateAtUseSite.

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,
         super(backend.compiler);
   String get name() => 'SSA code generator';
@@ skipping 238 matching lines @@
     action();
     expectedPrecedence = oldPrecedence;
     endExpression(precedence);
   }
 
   void preGenerateMethod(HGraph graph) {
     new SsaInstructionMerger(generateAtUseSite).visitGraph(graph);
     new SsaConditionMerger(generateAtUseSite,
                            controlFlowOperators).visitGraph(graph);
     SsaLiveIntervalBuilder intervalBuilder =
-        new SsaLiveIntervalBuilder(compiler);
+        new SsaLiveIntervalBuilder(compiler, generateAtUseSite);
     intervalBuilder.visitGraph(graph);
     SsaVariableAllocator allocator = new SsaVariableAllocator(
         compiler,
         intervalBuilder.liveInstructions,
         intervalBuilder.liveIntervals,
         generateAtUseSite,
         parameterNames);
     allocator.visitGraph(graph);
     variableNames = allocator.names;
   }
@@ skipping 2732 matching lines @@
       startBailoutSwitch();
     }
   }
 
   void endLabeledBlock(HLabeledBlockInformation labeledBlockInfo) {
     if (labeledBlockInfo.body.start.hasGuards()) {
       endBailoutSwitch();
     }
   }
 }