[commit: ghc] wip/erikd/remove-nat's head updated: RtsFlags: Make `mallocFailHook` const correct (8d42d24)

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Repository : ssh://git@git.haskell.org/ghc

Branch 'wip/erikd/remove-nat' now includes:

     fa86ac7 Make validDerivPred ignore non-visible arguments to a class type constructor
     36d29f7 StaticPointers: Allow closed vars in the static form.
     5f8c0b8 Revert "Revert "Use __builtin_clz() to implement log_1()""
     ef44606 Cleanups related to MAX_FREE_LIST
     63599c6 rts: Replace `nat` with `uint32_t`
     978c8dc rts/ProfHeap.c: Use `size_t` instead of `long`.
     5d64280 RtsUtils: Use `size_t` instead of `int` where appropriate
     8d42d24 RtsFlags: Make `mallocFailHook` const correct