Use dwgrep to test DWARF debug information

[sanxiyn]

dwgrep is a new tool written by Red Hat to query DWARF debug information. One explicit goal of the project is to support testing generation of DWARF debug information.

cc @michaelwoerister.

[jdm]

cc me

[michaelwoerister]

It certainly sounds interesting. There's also llvm-dwarfdump which LLVM uses for debuginfo autotests and pyelftools which also could be used for a similar purpose. I'd definitely like to do something like that when time permits.

[brson]

This is quite speculative. Better testing is always good, but I don't think we need to keep this wishlist item around.