[PATCH 1/2] gdb: Allow address space qualifier parsing in C++.

[Willgerodt, Felix]

> Do we have or want a test for this?
>
> Tom

This '@address_space_qualifier' is a bit of an undocumented and untested feature AFAIK. Even the avr tests for __flash don't test it.
I did search the git history a bit, but couldn't really determine why it was added. Only that it was added years before the __flash patch was.
But since it is there and since I need a language agnostic way to specify this, I plan to use it for a future target.

The only test I could currently write for this patch is something like:
gdb_test "*(@somerandomqualifiername int *) 0x12345678" "Unknown address space specifier: \"somerandomqualifiername\""

for a C++ program on any target. If you think that is valuable, I can easily add that.
The target I want to use this for in the end won't be ready for upstream for a while unfortunately.

Thanks,
Felix
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