Optimize ini_get
Summary: Add support to the JIT to recognize calls to ini_get for system settings and
substitute them with the value of the setting.
As part of this diff, I also removed the
system_get_custom_bool_settig API I added since it's no longer needed.
I also fixed an inconsistency between the version of IniSetting::Get
that takes a String& and a std::string& to return the setting value. The
std::string& version was incorrectly formatting double settings (they
included trailing 0's after the decimal point).
Reviewed By: @ptarjan
Differential Revision:
D1378334