Add an arity threshhold for binpacking arguments

[zetafunction]

Bugzilla Link	31907
Version	unspecified
OS	Windows NT

Extended Description

When a function has a lot of arguments, binpacking can makes things less readable. It would be nice if there was an arity threshhold; if you exceed it, then every argument is on its own line rather than being bin packed.

Here's the code before formatting:

kern_return_t result =
mach_vm_region(mach_task_self(),
reprotection_start,
reprotection_length,
VM_REGION_BASIC_INFO_64,
reinterpret_cast<vm_region_info_t>(&info),
&count,
&unused);

Here's the code after formatting:

kern_return_t result = mach_vm_region(
mach_task_self(), reprotection_start, reprotection_length,
VM_REGION_BASIC_INFO_64, reinterpret_cast<vm_region_info_t>(&info),
&count, &unused);

Here's how it ought to look:

kern_return_t result =
mach_vm_region(mach_task_self(),
reprotection_start,
reprotection_length,
VM_REGION_BASIC_INFO_64,
reinterpret_cast<vm_region_info_t>(&info),
&count,
&unused);