register passes on startup and delay parsing of command-line arguments #35402
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First register passes, then parse command line (similar to https://github.com/llvm/llvm-project/blob/3fefda6e578b431875405791bc7216595d767fbf/llvm/tools/llc/llc.cpp#L292-L330)
This allows us to set
JULIA_LLVM_ARGS=--print-before=and target more than the statically registered Julia passes