Merge #612

612: Turn Session Manager into basic singleton r=philberty a=CohenArthur

This PR changes the behavior of the compiler's session manager: Instead of keeping a single static instance in `rust-lang.cc`, the class now exposes a static instance via a `get_instance()` method. This is important for external module parsing as a new lexer and parser need to be instantiated during macro expansion, and a lexer must rely on a linemap, of which a single instance exists and is contained in the `Session` instance.

I ran into a few issues trying to make this a bit smarter (for example, by calling `init()` on the first `get_instance()` invocation) because I ran into a race condition. I haven't looked into it, but it seems that the calls to the various language hooks are sometimes multithreaded.

Co-authored-by: CohenArthur <arthur.cohen@epita.fr>

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