GDB 11.1 release prep update (2021-07-11)

[Joel Brobecker]

> Thanks to the very fast turnaround from Simon, Baris and Pedro, all three
> regressions have patches that resolve all the issues and the Eclipse CDT
> integration tests passed GDB 11 + those patches.
> 
> Thank you everyone and I look forward to testing more of the prereleases as
> they become available and include the referenced patches.

A big thank you indeed to everyone who contributed to the lightning-speed
fixes, and thanks to you Jonah for having reported those.

-- 
Joel