Add byte swap instructions for ARM and x86.

Change-Id: I03fdd61ffc811ae521141f532b3e04dda566c77d
diff --git a/compiler/dex/quick/x86/codegen_x86.h b/compiler/dex/quick/x86/codegen_x86.h
index b1d95ff..b28d7ef 100644
--- a/compiler/dex/quick/x86/codegen_x86.h
+++ b/compiler/dex/quick/x86/codegen_x86.h
@@ -170,6 +170,7 @@
 
   private:
     void EmitDisp(int base, int disp);
+    void EmitOpRegOpcode(const X86EncodingMap* entry, uint8_t reg);
     void EmitOpReg(const X86EncodingMap* entry, uint8_t reg);
     void EmitOpMem(const X86EncodingMap* entry, uint8_t base, int disp);
     void EmitMemReg(const X86EncodingMap* entry, uint8_t base, int disp, uint8_t reg);