Reenabling Ada by default

[Robert Dewar]

Duncan Sands wrote:

> There are also bugs in the run-time library.  They are often easier to understand
> than those in the compiler proper: no great expertise is needed.

Well the great majority of these fall under the obvious fix category.
Those that do not, e.g. subtle changes in the tasking support often
require even more specialized expertise than the compiler front end.

One thing that might be useful in this discussion is if people
chose particular examples of patches to illustrate what they
meant, rather than speaking in generalities.