Add low memory alarm system#310
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…loc. Currently, the actual low memory implementation is a placeholder.
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lowMemoryAlarm()should be called when memory pressure is detected. An example is ifsafeMalloc()and friends start returningNULLinstead of a proper memory region.To register a callback, which will evict some amount of evictable cached data (and will be called multiple times if required), use
registerLowMemoryAlarmCallback.lowMemoryAlarm()can be called in other places, for example, with iOS' low memory signal.This PR also adds
LIKELY()andUNLIKELY()macros, which are hints to the compiler that it should prioritize a code branch or another during generation (if supported).