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ghc-8.10.5 documentation states its needed LLVM 9 for llvm backend but compiler warns its unsupported

[   58s] checking llc version (9.0.1) is between 10 and 12... no
[   58s] configure: We only support llvm 10 to 12 (found 9.0.1).
[   58s] checking for opt-12... no
[   58s] checking for opt-12.0... no
[   58s] checking for opt-11... no
[   58s] checking for opt-11.0... no
[   58s] checking for opt-10... no
[   58s] checking for opt-10.0... no
[   58s] checking for opt... opt
[   58s] checking opt version (9.0.1) is between 10 and 12... no
[   58s] configure: We only support llvm 10 to 12 (found 9.0.1).
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