*** old/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/NullCheckOptimizer.java	Mon Mar 20 17:39:44 2017
--- new/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.lir/src/org/graalvm/compiler/lir/NullCheckOptimizer.java	Mon Mar 20 17:39:43 2017

*** 20,30 ****
--- 20,30 ----
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  package org.graalvm.compiler.lir;
  
! import java.util.ArrayList;
  
  import org.graalvm.compiler.core.common.cfg.AbstractBlockBase;
  import org.graalvm.compiler.lir.StandardOp.ImplicitNullCheck;
  import org.graalvm.compiler.lir.StandardOp.NullCheck;
  import org.graalvm.compiler.lir.gen.LIRGenerationResult;

*** 44,54 ****
--- 44,54 ----
      private static void foldNullChecks(LIR ir, AbstractBlockBase<?>[] blocks, int implicitNullCheckLimit) {
          for (AbstractBlockBase<?> block : blocks) {
              if (block == null) {
                  continue;
              }
!             ArrayList<LIRInstruction> list = ir.getLIRforBlock(block);
  
              if (!list.isEmpty()) {
  
                  LIRInstruction lastInstruction = list.get(0);
                  for (int i = 0; i < list.size(); i++) {