ftrace/x86: Add support for C version of recordmcount

ftrace/x86: Add support for C version of recordmcount

This patch adds the support for the C version of recordmcount and
compile times show ~ 12% improvement.

After verifying this works, other archs can add:

 HAVE_C_MCOUNT_RECORD

in its Kconfig and it will use the C version of recordmcount
instead of the perl version.

Cc: <[email protected]>
Cc: Michal Marek <[email protected]>
Cc: [email protected]
Cc: John Reiser <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>