Functions that needs locking fixes

bad_locking.txt

Here as the runtime functions that need locking to be adjusted.
There are two categories of locking issues that needs to be addressed:

- Manage allocation while holding a lock
This is bad for performance and is an issue for coop suspend

- Too much stuff done while holding a lock
Locks should only be used to protect data structures. The runtime should
use optimistic initialization everywhere that's possible as it reduces
the surface area of our locking protocol.

Bad functions:

mono_class_create_runtime_vtable