Stack overflow checks and NPE checks for optimizing.

Change-Id: I59e97448bf29778769b79b51ee4ea43f43493d96
diff --git a/compiler/optimizing/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index 9c12771..b7c2ad8 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -126,7 +126,7 @@
 class CodeGeneratorX86 : public CodeGenerator {
  public:
   explicit CodeGeneratorX86(HGraph* graph);
-  virtual ~CodeGeneratorX86() { }
+  virtual ~CodeGeneratorX86() {}
 
   virtual void GenerateFrameEntry() OVERRIDE;
   virtual void GenerateFrameExit() OVERRIDE;