Document workaround for Apple Silicon

[Baltoli]

This adds a pointer to documentation I've found that explains how to
build using stack on Apple Silicon. It's a temporary change until
better support is merged upstream, and requires no changes to the actual code of the project.

[ana-pantilie]

The latest LTS comes with GHC 8.10.7. Do you think updating to this LTS will fix the issue?

[github-actions]

name	diff_allocated_bytes	diff_max_live_bytes
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test/regression-evm/test-sum-to-n.sh	0.000002	0.000024
test/regression-evm/test-straight-line.sh	0.000018	0.079468
test/regression-evm/test-storagevar03.sh	-0.000010	-0.000052
test/regression-evm/test-straight-line-no-invalid.sh	0.000000	-0.003683
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test/regression-evm/test-sumTo10.sh	-0.000000	-0.020828
test/regression-evm/test-totalSupply.sh	0.000001	-0.005287
test/regression-evm/test-pop1.sh	0.000000	0.008921
test/regression-evm/test-branching-no-invalid.sh	-0.000000	0.000220
test/regression-evm/test-mul0.sh	0.000000	-0.084272
test/regression-evm/test-branching-invalid.sh	-0.000000	-0.003163
test/regression-evm/test-add0.sh	-0.000000	-0.051529
test/regression-evm/test-addu48u48.sh	-0.000004	0.055657
test/regression-evm/test-and0.sh	0	-0.010303
test/regression-wasm/test-locals.sh	0.000000	0.000001
test/regression-wasm/test-loops.sh	-0.000010	-0.000000
test/regression-wasm/test-wrc20.sh	0.000001	-0.007064
test/regression-wasm/test-memory.sh	0.000008	-0.000031
test/regression-wasm/test-simple-arithmetic.sh	-0.000021	0.000000

[Baltoli]

Not quite, unfortunately - the compiler support is one part of the problem, but the other part is that stack itself hasn't yet been updated to support Apple Silicon. It seems like the current approaches are to either rebuild stack from source, or use the flags proposed in this PR to force it to get an appropriate compiler.

[ana-pantilie]

I see, thank you for looking into this! 😄

[github-actions]

name	diff_allocated_bytes	diff_max_live_bytes
test/regression-evm/test-sha3_bigSize.sh	-0.000006	-0.004043
test/regression-evm/test-sum-to-n.sh	0.000032	0.016449
test/regression-evm/test-straight-line.sh	-0.000001	0.000105
test/regression-evm/test-storagevar03.sh	-0.000005	0.000896
test/regression-evm/test-straight-line-no-invalid.sh	-0.000001	0.008210
test/regression-evm/test-lemmas.sh	0.000002	0.047210
test/regression-evm/test-sumTo10.sh	-0.000000	-0.002783
test/regression-evm/test-totalSupply.sh	-0.000002	0.000001
test/regression-evm/test-pop1.sh	-0.000009	0.000642
test/regression-evm/test-branching-no-invalid.sh	-0.000000	-0.027207
test/regression-evm/test-mul0.sh	-0.000000	-0.077935
test/regression-evm/test-branching-invalid.sh	-0.000000	0.023511
test/regression-evm/test-add0.sh	-0.000000	-0.088995
test/regression-evm/test-addu48u48.sh	0.000002	-0.106989
test/regression-evm/test-and0.sh	-0.000000	0.019284
test/regression-wasm/test-locals.sh	0.000001	0.000003
test/regression-wasm/test-loops.sh	0.000041	0.000170
test/regression-wasm/test-wrc20.sh	-0.000005	-0.002869
test/regression-wasm/test-memory.sh	-0.000016	0.000263
test/regression-wasm/test-simple-arithmetic.sh	0.000046	-0.000003