[llvm-dev] switch to llvm new pass manager by default?

[Ashok Anand via llvm-dev]

It seems that in llvm 5.0.1, new pass manager wasn't ready to be used by
default.
Can we used that in llvm 7.0.1 or llvm 7.1.0?  What are the implications?
have we seen any compile time regressions or improvements with the new pass
manager if we choose opt level to be 3 or so?
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