The following patch adds minimal support for software performance counters for ia64.

For the kernel the patch enables configuration of the perf counter
option, adds the perf_counter_open syscall, and includes a minimal machine
specific asm/perf.h header file.

For the perf tool the header perf.h includes an ia64 specific section
and the options used in the Makefile were adjusted to allow
compilation on ia64.  The -Wcast-align gives "cast increases required
alignment of target type" warning for the list_for_each_entry()
macro. The "-fno-strict-aliasing" was used to avoid warnings for
"dereferencing type-punned pointer will break strict-aliasing rules"
warnings for sscanf() functions in util/trace-event-parse.c

-Will

Signed-off-by: William Cohen <wcohen@redhat.com>