x86: add @rex to cs_x86 struct. updated python & java binding for this change
diff --git a/include/x86.h b/include/x86.h
index 50e0648..a56de3e 100644
--- a/include/x86.h
+++ b/include/x86.h
@@ -188,9 +188,12 @@
 
 	// Instruction opcode, wich can be from 1 to 3 bytes in size.
 	// This contains VEX opcode as well.
-	// An opcode byte gets value 0 when irrelevant.
+	// An trailing opcode byte gets value 0 when irrelevant.
 	uint8_t opcode[4];
 
+	// REX prefix: only a non-zero value is relavant for x86_64
+	uint8_t rex;
+
 	// Address size, which can be overrided with above prefix[5].
 	uint8_t addr_size;