Fixing function schema parser for Android (#19281)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19281
String<->Number conversions aren't available in the STL used in our Android environment.
This diff adds workarounds for that so that the function schema parser can be compiled for android
Reviewed By: dzhulgakov
Differential Revision: D14931649
fbshipit-source-id: d5d386f2c474d3742ed89e52dff751513142efad
