[Issue 13243] Mago doesn't seem to work for Win64

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13243

--- Comment #10 from Rainer Schuetze <r.sagitario at gmx.de> ---
(In reply to Manu from comment #9)
> 
> Okay, well, it works now... except there's a new problem.
> It takes 40-50 seconds to launch the exe, so every time I restart I have to
> wait a minute.
> Switch back to VS debugger, and it launches immediately as usual.

At least, some progress :) I noticed a delay of a few seconds in my tests, but
these were probably just too small projects.

There is some problem with mapping PDB semantics to the way mago handles
symbols and line number lookup, which is very much tuned to match CodeView data
as stored in the Win32 executable.

I refactored it a little to better take advantage of the way you have to access
line numbers in PDB files and updated beta2 again.

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