We now have two darwin flavours. AArch64-Darwin, and
x86_64-darwin, the latter one which has proper custom
adjustor support, the former though relies on libffi.

Mixing both leads to odd crashes, as the closures might
not fit the size of the libffi closures. Hence this
needs to be guarded by the USE_LBFFI_FOR_ADJUSTORS guard.

Original patch by Hamish Mackenzie

This increases the critical path length but in practice will reduce
pressure on runners because less jobs overall will be spawned.

See #20003

[skip ci]

Fix found by Adam Gundry.

There are some obscure situations where the RHS of a rule can contain a
tick which is not mentioned anywhere else in the program. If this
happens you end up with an obscure linker error. The solution is quite
simple, traverse the RHS of rules to also look for ticks. It turned out
to be easier to implement if the traversal was moved into CoreTidy
rather than at the start of code generation because there we still had
easy access to the rules.

./StreamD.o(.text+0x1b9f2): error: undefined reference to 'StreamK_mkStreamFromStream_HPC_cc'
./MArray.o(.text+0xbe83): error: undefined reference to 'StreamK_mkStreamFromStream_HPC_cc'
Main.o(.text+0x6fdb): error: undefined reference to 'StreamK_mkStreamFromStream_HPC_cc'

Another step towards a simpler design for exact printing.

Updates the haddock submodule.