[llvm-dev] Repeated application of optimization passes

[Russell Wallace via llvm-dev]

Within the LLVM pass manager infrastructure, suppose we have two
transformation passes, pass A makes some improvements, then pass B does
likewise, but this creates opportunities for pass A to create further
improvements (e.g. suppose B was function inlining) so it's desirable to
run A again.

How does the LLVM pass manager currently deal with this?
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