When exporting an global multiple times under different names, make sure
that they alias in the generated code.
As a consequence, the compiler maintains the original unique name and in
Rust and C++ makes only the exported names public. In the interpreter
the internal name is theoretically still accessible from the outside.
The pass must be done at the begining so that synthetised property don't
become public, and also so that analyses pass can use the public api information
