Can't dynamic stub functions by name in MAC OS

[lingjf]

It success to dynamic stub by function pointer, but it fail to dynamic stub by function name. It can be reproduced in unit test environment.

H2CASE(dynamic_stub, "test dynamic stub local static function")

Analysis:
mprotect() failed because the address which is generated by 'nm' with the function name.
nm's output symbol address is incorrect (comparing with function pointer).