Revert "codegen: Create only one vala-array helper function per array-type"
Revert "codegen: Create only one vala-array helper function per array-type"

This reverts commit fba08583d940af80a0d6b7045294de00c568d6a4.

https://bugzilla.gnome.org/show_bug.cgi?id=761736

frida/vala,frida/vala,GNOME/vala,frida/vala,frida/vala,GNOME/vala,GNOME/vala,frida/vala,GNOME/vala