Bug 18485 – dmd generates a binary that throws SIGSEGV when using interface files (di) importing modules

D compiler (dmd) generates a binary file (test program) that throws a SIGSEGV when it is linked against a library (*.so) using an interface file (*.di) instead of a source file (*.di) when importing the library API (module). Compiling the library is made with or without -H option to generate or not the interface file (*.di). After that, the test program is compiled against the library importing the source file (*.d). With this import, [as stated in documentation](https://dlang.org/dmd-linux.html#interface-files), `dmd` uses interface files before source files if they are present. And, when the test program is compiled using that interface file, that program throws a SIGSEGV on every run. Repository with a proof of concept: https://github.com/diegolagoglez/dmd-sigsegv-using-di-proof-of-concept

Still fails using dmd 2.084.0.

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