[LLVMdev] Heads up: Pass Manager changes will be starting shortly

[Chandler Carruth]

I just wanted to give everyone a head up. I'm starting work on the pass
manager based on numerous list discussions and some IRC discussions.

The first steps will be marking the existing code as "legacy" and clearing
a path to build new facilities here. From there I'll start building the new
facilities without enabling them.

Some explicit legacy support goals:

1) I'm going to build a bridge so that an existing Pass can be inserted
into the new pass manager with some adaptors and everything will just work.
This may require touching the code that sets up the pass manager, but not
the code that defines a pass. This will work even once the new pass manager
bits are enabled if at all possible.

2) If you have code that includes the current PassManager headers, nothing
should break right away, but when the new manager infrastructure is
enabled, I'll likely remove the old PassManager headers, breaking this
code. My goal is to only break code that directly interacts with the
management layer.

3) I'm going to play namespace games so that we don't end up with
PassManagerV2 and other silly names. The legacy headers will paper over
this to keep legacy code compiling without change.

-Chandler
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