x86/x86_64: Add rep_movs instructions

x86: This patch adds rep_movsb with tests
x86_64: This patch adds rep_movsb, rep_movsl with tests

Test: $ANDROID_HOST_OUT/nativetest{64}/art_compiler_host_tests/art_compiler_host_tests
Signed-off-by: Shalini Salomi Bodapati <shalini.salomi.bodapati@intel.com>
Change-Id: Ie49434c88e690007bdb7e773f746eae66b197574
diff --git a/compiler/utils/x86_64/assembler_x86_64.h b/compiler/utils/x86_64/assembler_x86_64.h
index 7d61500..ea944c2 100644
--- a/compiler/utils/x86_64/assembler_x86_64.h
+++ b/compiler/utils/x86_64/assembler_x86_64.h
@@ -981,6 +981,8 @@
   void repe_cmpsl();
   void repe_cmpsq();
   void rep_movsw();
+  void rep_movsb();
+  void rep_movsl();
 
   void ud2();