Splitting up 27_io/basic_istream/ignore/wchar_t/94749.cc (takes too long)

[Hans-Peter Nilsson]

Hi!

The test 27_io/basic_istream/ignore/wchar_t/94749.cc takes
about 10 minutes to run for cris-elf in the "gdb simulator"
here on my arguably way-past-retirement machine (and it
looks like it gained a minute with LRA).  I've seen it
timing out every now and then on busy days with load >
`nproc`.  Usually it happens some time after I've forgot
about why. :)

It has had some performance surgery before (pruning for
simulators, doubling timeout for ilp32).  I'd probably just
try cutting along the function boundaries and keep those
parts separate that have >1 min execution time.

Anyway, your thoughts on the matter would be appreciated.

brgds, H-P