[Build] Enable brpc cpu and heap profile

[morningman]

Proposed changes

Enable brpc profile with macro BRPC_ENABLE_CPU_PROFILER,
so that we can get cpu and heap profile at runtime via brpc web interface.

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Further comments

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[stdpain]

Is there any possibility that this macro definition added to CXX_COMMON_FLAGS could cause Link problems in ASAN or LSAN mode?

[yangzhg]

LGTM

[morningman]

Is there any possibility that this macro definition added to CXX_COMMON_FLAGS could cause Link problems in ASAN or LSAN mode?

It is ok for CPU profile, and for heap profile, it will report error like:
To enable all profilers, link tcmalloc and define macros BRPC_ENABLE_CPU_PROFILER
which is reasonable.