GDB 9.1 release -- 2019-11-01 Update

[Andrew Burgess]

* Joel Brobecker <brobecker@adacore.com> [2019-11-03 17:16:26 -0800]:

> If there are others you think need to be pushed before we branch,
> please let me know. Another way to catch my attention is to use PRs
> with the target milestone being set to "9.1".

I'd was hoping to get these merged into 9.1 as they provide MI access
to some new CLI commands:

  https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/264
  https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/265
  https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/266
  https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/267
  https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/268
  https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/269

Most of these have already had an earlier versions reviewed, so
hopefully there isn't much more that needs doing.

Also this fixes a regressions from earlier versions:

  https://gnutoolchain-gerrit.osci.io/r/c/binutils-gdb/+/511

but this can easily be merged into the release branch later.

thanks,
Andrew