[PATCH] Added verbosity to dwarf2*

[Michal Ludvig]

Michal Ludvig wrote:
> this patch adds some more verbosity to GDB's error messages. I've found 
> it very useful for bugreports, because you can locate the failing 
> testcase much faster when knowing in what objfile it fails.
> It also helps GCC developers hunting their bugs in DWARF2 generator.
> 
> OK to commit to mainline? And to 5.3 branch?

Because noone complained for a long time and it's only about changing 
some strings, not changing a functionality, I've committed the patch to 
both mainline and branch.

Michal Ludvig
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