Make HForeignCode 'isAllocation' property available to optimization

pkg/compiler/lib/src/ssa/optimize.dart

Index: pkg/compiler/lib/src/ssa/optimize.dart
diff --git a/pkg/compiler/lib/src/ssa/optimize.dart b/pkg/compiler/lib/src/ssa/optimize.dart
index 5dd8092f656518ee44e04df59a96f36f5b2afad5..998ab1879131517cd2120afd67414d5e065b467d 100644
--- a/pkg/compiler/lib/src/ssa/optimize.dart
+++ b/pkg/compiler/lib/src/ssa/optimize.dart
@@ -1907,6 +1907,9 @@ class SsaLoadElimination extends HBaseVisitor implements OptimizationPhase {
   }
 
   void visitInstruction(HInstruction instruction) {
+    if (instruction.isAllocation) {
+      memorySet.registerAllocation(instruction);
+    }
     memorySet.killAffectedBy(instruction);
   }