demangled output

after running "funccount" on Mozilla firefox:

```
_ZN7mozilla6detail9MutexImplD2Ev 1126
_ZN7mozilla6detail9MutexImplC2ENS_12recordreplay8BehaviorE 1153
moz_xrealloc 1305
realloc 1366
moz_arena_realloc 2284
_ZN7mozilla6detail21ConditionVariableImpl8wait_forERNS0_9MutexImplERKNS_16BaseTimeDurationINS_27TimeDurationValueCalculatorEEE 3910
_ZN7mozilla6detail21ConditionVariableImpl10notify_oneEv 4848
_ZN7mozilla29BaseTimeDurationPlatformUtils21TicksFromMillisecondsEd 14664
_ZN7mozilla29BaseTimeDurationPlatformUtils9ToSecondsEl 16799
moz_arena_malloc 25022
moz_xmalloc 27496
_ZN7mozilla9TimeStamp8NowFuzzyENS_14TimeStamp63BitE 28645
_ZN7mozilla9TimeStamp3NowEb 28671
_ZN7mozilla9TimeStamp18GetFuzzyfoxEnabledEv 29441
malloc 42399
_ZN7mozilla6detail9MutexImpl4lockEv 51988
_ZN7mozilla6detail9MutexImpl6unlockEv 51990
```
I got the above output.

can we do better? if you do "objdump --demangle" you can easily get the demangle output from the binary. If someone can suggest how and where to modify the BCC (which I don't know) perhaps I can try combining it with:

https://github.com/whitequark/python-itanium_demangler

and submit a patch request.

Start with the funccount output path and compare its symbol handling with objdump --demangle. Review the proposed python-itanium_demangler integration, and consider the work complete when the displayed mangled symbols are rendered as demangled names without changing their counts.

Written by the indexing model from the issue text.