Add upstream yalloc allocator
This MR implements the yalloc allocator and patches created by @HaydenKow to provide an API to trigger manual defragmentation of VRAM.
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Add upstream yalloc allocator -
Update to @HaydenKow's fork -
Use yalloc in place of pvr_mem_alloc/free throughout -
Add a KOS specific API -
Automatically defrag when necessary -
Implement the GL_ATI_meminfo extension
Edited by Luke Benstead