Add size remarks to MachineFunctionPass
This adds per-function size remarks to codegen, similar to what we have in the
IR layer as of r341588. This only impacts MachineFunctionPasses.
This does the same thing, but for `MachineInstr`s instead of just
`Instructions`. After this, when a `MachineFunctionPass` modifies the number of
`MachineInstr`s in the function it ran on, you'll get a remark.
To enable this, use the size-info analysis remark as before.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341876
91177308-0d34-0410-b5e6-
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