Devise a way to test debuginfo

[brson]

Debug info is very prone to breakage. We should come up with a way to test it. Maybe look into how LLVM does it.

[brson]

One obvious thing is setting up a debuginfo bot that builds everything with debug info, but we need real debuginfo tests too.

[graydon]

yeah. there are several tools that know how to dump dwarf to text, and gdb can also be driven by batch input as well as embedded python scripts. this should be very possible.

[brson]

@bleibig added support to compiletest for driving gdb and interpreting the results. Considering this done, now let's use it!