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Handle large ARR_WORDS in heap census (fix #17572)

Sylvain Henry requested to merge hsyl20/ghc:hsyl20-heap-census into master

Commit description:

Handle large ARR_WORDS in heap census (fix #17572)

We can do a heap census with a non-profiling RTS. With a non-profiling
RTS we don't zero superfluous bytes of shrunk arrays hence a need to
handle the case specifically to avoid a crash.

Revert part of a586b33f8e8ad60b5c5ef3501c89e9b71794bbed
Edited by Sylvain Henry

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