perf tools: Add support for the xtensa architecture
perf tools: Add support for the xtensa architecture

Tested using kernel tracepoints on a QEMU simulated environment.

Kernel support for perf depends on the patch "xtensa: enable
HAVE_PERF_EVENTS", which is scheduled for v3.14.

Hardware performance counters are not supported under xtensa yet.

Acked-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@kernel.org>
Acked-by: Max Filippov <8c5ea195856807f4f02a6e0749c87ea6b7375f38@gmail.com>
Cc: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@redhat.com>
Cc: Paul Mackerras <19a0ba370c443ba08d20b5061586430ab449ee8c@samba.org>
Cc: Peter Zijlstra <645ca7d3a8d3d4f60557176cd361ea8351edc32b@chello.nl>
Cc: 76026cac76fffa8b029166efa1c2d314346e1f47@linux-xtensa.org
Link: f627363c8fc4148ea5d1033536273b63eb7d6322@tkos.co.il
Signed-off-by: Baruch Siach <53ccad33e0625915318fb3bc832e5c1c413d1294@tkos.co.il>
Signed-off-by: Arnaldo Carvalho de Melo <293abb6b76d7791c0732cc517d38c4b5c734b87f@redhat.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs