Add support for WASM backend #3350

Job	Run time
unit-tests	10s
shellFor-hoogle	17s
cabal-doExactConfig	15s
shellFor-multiple-package	20s
shellFor-not-depends	24s
cabal	13s
runghc	16s
nix-build	6m 37s
multi-target	41s
maintainer-scripts	10s
shellFor-single-package	29s
tests-benchmarks	15s
build-extra-hackages	15s
plan-extra-hackages	14s
haskell-nix-roots-do-not-require-IFDs	27s
hydra-without-remote-builders-ghc9102	1m 20s
hix-cabal	15s
docs	1h 12m 23s
hix	2h 18m 22s
hydra-ifdLevel-2	20m 17s
check-nix-tools	15s
update-docs	9s
closure-size	9s
hydra-ifdLevel-0-and-1	20m 17s
hydra-ifdLevel-3	30m 16s
check-materialization-concurrency	22s
hydra-without-remote-builders-ghc967	1m 4s
check-path-support	9s
unit-tests	10s
build-extra-hackages	15s
runghc	16s
plan-extra-hackages	14s
shellFor-not-depends	24s
shellFor-multiple-package	20s
maintainer-scripts	10s
shellFor-hoogle	17s
nix-build	6m 37s
cabal	13s
tests-benchmarks	15s
hix	2h 18m 22s
check-nix-tools	15s
shellFor-single-package	29s
hydra-without-remote-builders-ghc9102	1m 20s
hix-cabal	15s
cabal-doExactConfig	15s
multi-target	41s
closure-size	9s
check-path-support	9s
hydra-ifdLevel-2	20m 18s
hydra-ifdLevel-3	30m 18s
update-docs	9s
check-materialization-concurrency	22s
hydra-ifdLevel-0-and-1	5m 4s
hydra-without-remote-builders-ghc967	1m 4s
docs	1h 12m 23s
haskell-nix-roots-do-not-require-IFDs	27s
	9h 37m 32s

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