RTS allocation sites do not try GCing before failing

While working on the IO manager, @duncan and I noticed that various large allocation sites within primops may fail spuriously when +RTS -M... is used. Specifically, these primops call allocateMayFail and on failure immediately throw an exception. However, it is possible that the allocation would have succeeded if we first attempted to GC.

The following primops exhibit this pathology:

stg_newPinnedByteArrayzh
stg_newByteArrayzh
stg_newAlignedPinnedByteArrayzh
stg_newArrayzh
stg_newSmallArrayzh
stg_unpackClosurezh

Edited Oct 19, 2023 by Ben Gamari

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