lib: Emit nop,no10 instructions combo for x86_64 arch

Now that we have no10 optimization support in kernel, let's emit
nop,nop10 for usdt probe. We leave it up to the library to use
desirable nop instruction.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>

Author: olsajiri

usdt.h

@@ -312,6 +312,8 @@ struct usdt_sema { volatile unsigned short active; };
 #ifndef USDT_NOP
 #if defined(__ia64__) || defined(__s390__) || defined(__s390x__)
 #define USDT_NOP			nop 0
+#elif defined(__x86_64__)
+#define USDT_NOP                       .byte 0x90, 0x66, 0x2e, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00 /* nop, nop10 */
 #else
 #define USDT_NOP			nop
 #endif