mem: make allocator calls take a context pointer #374

Job	Run time
linter	42s
posix (linux, clang, shared)	2m 18s
windows (shared)	3m 4s
posix (linux, clang, shared, ASan)	2m 24s
windows (static)	35s
posix (linux, clang, static)	20s
posix (linux, clang, static, ASan)	14s
posix (linux, gcc, shared)	2m 15s
posix (linux, gcc, shared, ASan)	2m 22s
posix (linux, gcc, static)	7s
posix (linux, gcc, static, ASan)	28s
posix (macos, clang, shared)	27s
posix (macos, clang, static)	12s
posix (macos, clang, static, ASan)	44s
	16m 12s

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