Fix Windows build by forcing initialization order, fixes #4068

[mmicko]

Windows build is crashing on start, since registering of passes crashed. IdString can not be used as variable default values since order of initialization is not guaranteed, and MinGW compiler always doing it in different order than Clang.
Using static is not strictly necessary but makes sure to do this only once per run.
Have tried to make this with less changes as possible, but guess m_ prefix for variables should be removed since they are local.
FYI doing init as part of constructor initialization does not help, since that is actually same moment of execution as previous code.

[povik]

I suppose another approach is to paste all these IDs into kernel/constids.inc but given how vendor-specific those IDs are, I don't know if we want to do that.

[povik]

Btw if it was e.g.

const RTLIL::IdString split_cell_type("$__QLF_TDP36K");

instead of

const RTLIL::IdString split_cell_type = ID($__QLF_TDP36K);

that would still be an issue, right?

[mmicko]

@povik Right, using kernel/constids.inc should not be option for vendor specific things, and second example would fail as well since IdString global is not yet constructed. We had similar issue in past, but it was always affecting just Windows :( and we were not able to reproduce these issues on Linux.

[QuantamHD]

Would this change have potentially resolved it? #4091

[cr1901]

Just stopping by to confirm that this fixes my issue as described in #4068. Tyvm @mmicko for the patch :).