add yp_alloc to begin creating our own allocator #1375
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This introduces
yp_malloc
yp_calloc
andyp_free
as allocation APIs which we can use to manage allocations.Once these are centralized we can use xmalloc if in a Ruby context and/or use an arena allocator to reduce syscalls to malloc.
Related to this issue: #1337
This is a small part of my working arena allocator here: https://github.com/HParker/yarp/tree/introduce-yp_malloc
In an effort to make smaller changes at a time, this only updates direct malloc/calloc/free calls in yarp.c. There are more allocations that I will move in followup PRs.