regress: add x64_rip_relative.py

suite/regress/x64_rip_relative.py

+#!/usr/bin/python
+
+# Test RIP relative instruction
+
+# Github issue: #9
+# Author: Nguyen Anh Quynh
+
+from keystone import *
+
+import regress
+
+class TestX86(regress.RegressTest):
+    def runTest(self):
+        # Initialize Keystone engine
+        ks = Ks(KS_ARCH_X86, KS_MODE_64)
+        # Assemble to get back insn encoding & statement count
+        encoding, count = ks.asm(b"MOV QWORD PTR [RIP+0xF55AF], 0xFF")
+        # Assert the result
+        self.assertEqual(encoding, [ 0x48, 0xc7, 0x05, 0xaf, 0x55, 0x0f, 0x00, 0xff, 0x00, 0x00, 0x00 ])
+
+
+if __name__ == '__main__':
+    regress.main()