perf ui/hist: Consolidate hpp helpers

perf ui/hist: Consolidate hpp helpers

Most of hpp helper functions do same jobs for different fields thus
consolidate them to appropriate functions/macros.

Signed-off-by: Namhyung Kim <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>