Fix the number of "to python" child arguments when the array length argument is shared.

When the arg cache already exists, we still need to increment n_to_py_child_args if this is an output argument.
13 jobs for fix-to-py-child-arg-count in 7 minutes and 16 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build And Test
passed #477316
gnome-master

00:01:21

passed #477317
gnome-master-gtk4

00:01:47

passed #477313
pypy2.7

00:04:03

failed #477314
allowed to fail
pypy3.6

00:02:00

passed #477308
python2.7

00:04:30

passed #477309
python3.5

00:03:07

passed #477310
python3.6

00:02:24

passed #477311
python3.7

00:03:46

passed #477312
python3.8

00:05:03

passed #477306
win32
python3-mingw32

00:05:24

passed #477307
win32
python3-mingw64

00:05:37

passed #477315
xenial-i386-py2

00:01:34

 
  Coverage
passed #477318
coverage

00:01:02

 
Name Stage Failure
failed
pypy3.6 Build And Test

Ok: 0
Expected Fail: 0
Fail: 1
Unexpected Pass: 0
Skipped: 0
Timeout: 0

ERROR: Job failed: exit code 1