bug#20629: 25.0.50; Regression: TAGS broken, can't find anything in C++ files.

[Stefan Monnier]

>> > Patches from completion experts are welcome.
>> Not an expert, but this should do it. I wonder if we'll get many junk 
>> completions this way, in certain situations:
> What kind of junk?

BTW, it might be worthwhile to try and replace the obarray with
a function which directly searches the corresponding tags buffers.
Searching those buffers might not be significantly slower than searching
the obarray, with the advantage that we avoid the "building the
completion table" step.


        Stefan