Declare large amounts of constant data

Simon Marlow wrote in Bug#635718:
"It is true that GHC doesn't have a good way to declare
large amounts of constant data.  This is a shortcoming,
but not a bug (please by all means submit a feature
request)."

Submitting as requested:)

Edited Mar 09, 2019 by Ian Lynagh -

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Declare large amounts of constant data