More memory leak fixes.

test/cctest/compiler/test-instruction.cc

Index: test/cctest/compiler/test-instruction.cc
diff --git a/test/cctest/compiler/test-instruction.cc b/test/cctest/compiler/test-instruction.cc
index 865adcc228ee723574b48a7be617fc3177612032..e3a89e475b1c217ca2c015086a98dc5203008cfe 100644
--- a/test/cctest/compiler/test-instruction.cc
+++ b/test/cctest/compiler/test-instruction.cc
@@ -35,6 +35,8 @@ class InstructionTester : public HandleAndZoneScope {
         machine(zone(), kMachineWord32),
         code(NULL) {}
 
+  ~InstructionTester() { delete code; }
+
   Isolate* isolate;
   Graph graph;
   Schedule schedule;