Stack overflow checks and NPE checks for optimizing.

Change-Id: I59e97448bf29778769b79b51ee4ea43f43493d96
diff --git a/compiler/utils/x86_64/assembler_x86_64.h b/compiler/utils/x86_64/assembler_x86_64.h
index e988029..1d6655c 100644
--- a/compiler/utils/x86_64/assembler_x86_64.h
+++ b/compiler/utils/x86_64/assembler_x86_64.h
@@ -391,6 +391,8 @@
   void testl(CpuRegister reg1, CpuRegister reg2);
   void testl(CpuRegister reg, const Immediate& imm);
 
+  void testq(CpuRegister reg, const Address& address);
+
   void andl(CpuRegister dst, const Immediate& imm);
   void andl(CpuRegister dst, CpuRegister src);
   void andq(CpuRegister dst, const Immediate& imm);