[patch] Profile_event class

[Don McCoy]

This patch integrates the functions needed for the impl_performance() 
interface along with some new functions needed for handling events more 
efficiently.  It also uses more descriptive names for the FFT events, 
for example:

# mode: pm_accum
# timer: x86_64_tsc_time
# clocks_per_sec: 3591371008
#
# tag : total ticks : num calls : op count : mflops
fwd fft, cplx-cplx, rbv : 102141 : 1 : 51200 : 1800.24
inv fft, cplx-cplx, rbv : 95490 : 1 : 51200 : 1925.63

Note: rbv = return by value.  The others should be readable.  Full 
documentation will follow soon.

Regards,

-- 
Don McCoy
don (at) CodeSourcery
(888) 776-0262 / (650) 331-3385, x712
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