[PATCH] Cleanup inconsistent MachineVerifier+Print usage

[Matthias Braun]

Hi Evan, list,

attached are patches that cleanup some of the mess in CodeGen/Passes.cpp; specifically they change the behaviour to add print+verify passes after each MachineFunction pass by default instead of on request. This should help debugging as you don't miss intermediate steps that are not printed and should improve dicipline to produce correct machine code as newly written passes will have verification enabled by default.

Greetings
    Matthias

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