fix-build-using-unregisterized-v8.4

fix-build-using-unregisterized-v8.4

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  error: ‘stg_MUT_ARR_PTRS_FROZEN0_info’ undeclared (first use in this function); did you mean ‘stg_MUT_ARR_PTRS_FROZEN_DIRTY_info’?
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 For more information, see https://gitlab.haskell.org/ghc/ghc/issues/15913.
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 This patch can be removed, once ghc-8.4 is no longer the bootstrap compiler.
Author: Ilias Tsitsimpis <iliastsi@debian.org>
Bug: https://gitlab.haskell.org/ghc/ghc/issues/15913
Bug-Debian: https://bugs.debian.org/932941

Gbp-Pq: Name fix-build-using-unregisterized-v8.4