Make combine-after-change-calls work in the common case again

* src/insdel.c (signal_after_change): Allow combine_after_change_calls
even when syntax-ppss-flush-cache is on before-change-functions.
1 job for master in 8 minutes and 15 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
failed #1684
test-all

00:08:15

 
Name Stage Failure
failed
test-all Test
Makefile:807: recipe for target 'bootstrap-emacs.pdmp' failed
make[2]: *** [bootstrap-emacs.pdmp] Error 255
make[2]: Leaving directory '/builds/emacs/emacs/src'
Makefile:424: recipe for target 'src' failed
make[1]: *** [src] Error 2
make[1]: Leaving directory '/builds/emacs/emacs'
Makefile:1115: recipe for target 'bootstrap' failed
make: *** [bootstrap] Error 2
ERROR: Job failed: exit code 1