chore(ssa): Remove mem2reg run before flattening (#4415) #350

Job	Run time
Build base nargo docker image	7m 56s
Build base js docker image	3m 1s
Build acvm js	2m 42s
Build noirc abi	2m 28s
Build noir js types	59s
Test noirc abi	59s
Test noirc abi browser	1m 43s
Build noir wasm	3m 49s
Test acvm js browser	1m 39s
Test acvm js	57s
Build Barretenberg backend	1m 0s
Test Barretenberg backend	58s
Artifact nargo	45s
Test nargo	15m 38s
Build noirjs	1m 6s
Test noir wasm browser	0s
Test noir wasm	0s
Test noirjs	1m 52s
Integration test	0s
Build noir codegen	59s
Integration test browser	0s
Test noir codegen	1m 0s
End	1s
	49m 32s

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