perf tools: Update x86's syscall_64.tbl, adding 'io_pgetevents' and 'rseq'

This updates the tools/perf/ copy of the system call table for x86 which makes
'perf trace' become aware of the new 'io_pgetevents' and 'rseq' syscalls, no
matter in which system it gets built, i.e. older systems where the syscalls are
not available in the running kernel (via tracefs) or in the system headers will
still be aware of these syscalls/.

These are the csets introducing the source drift:

  05c17cedf8 ("x86: Wire up restartable sequence system call")
  7a074e96de ("aio: implement io_pgetevents")

This results in this build time change:

  $ diff -u /tmp/build/perf/arch/x86/include/generated/asm/syscalls_64.c.old /tmp/build/perf/arch/x86/include/generated/asm/syscalls_64.c
  --- /tmp/build/perf/arch/x86/include/generated/asm/syscalls_64.c.old	2018-06-15 11:48:17.648948094 -0300
  +++ /tmp/build/perf/arch/x86/include/generated/asm/syscalls_64.c	2018-06-15 11:48:22.133942480 -0300
  @@ -332,5 +332,7 @@
          [330] = "pkey_alloc",
          [331] = "pkey_free",
          [332] = "statx",
  +       [333] = "io_pgetevents",
  +       [334] = "rseq",
   };
  -#define SYSCALLTBL_x86_64_MAX_ID 332
  +#define SYSCALLTBL_x86_64_MAX_ID 334
  $

This silences the following tools/perf/ build warning:

  Warning: Kernel ABI header at 'tools/perf/arch/x86/entry/syscalls/syscall_64.tbl' differs from latest version at 'arch/x86/entry/syscalls/syscall_64.tbl'

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-tfvyz51sabuzemrszbrhzxni@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/entry/syscalls/syscall_64.tbl

@@ -341,6 +341,8 @@
 330	common	pkey_alloc		__x64_sys_pkey_alloc
 331	common	pkey_free		__x64_sys_pkey_free
 332	common	statx			__x64_sys_statx
+333	common	io_pgetevents		__x64_sys_io_pgetevents
+334	common	rseq			__x64_sys_rseq
 
 #
 # x32-specific system call numbers start at 512 to avoid cache impact