Move most of the delay# impl from cmm to C

Moves it into the IOManager.c where we can follow the new pattern of
switching on the selected I/O manager.

Uses a new IOManager API: syncDelay, following the naming convention of
sync* for thread-synchronous I/O & timer/delay operations.

As part of porting from cmm to C, we maintain the rule that the
why_blocked gets accessed using load acquire and store release atomic
memory operations. There was one exception to this rule: in the delay#
primop cmm code on posix (not win32), the why_blocked was being updated
using a store relaxed, not a store release. I've no idea why. In this
convesion I'm playing it safe here and using store release consistently.