[branch abandoned, ignore]

[TiborGY]

PR 1/2
I am planning to add some optimization remarks to the PartiallyInlineLibCalls pass.
However, since this pass does not emit any optimization remarks yet, I have to add the "infrastructure" for that first, which is what this PR is about.

Questions/points of uncertainty for reviewers:

1. I am getting the pointer for the OptimizationRemarkEmitter object from the OptimizationRemarkEmitter analysis pass. This seems to be used in other optimization passes for this purpose, but I cannot claim that I understand it.
2. It looks like getting an OptimizationRemarkEmitter object brings in Lazy Branch Probability Analysis and Lazy Block Frequency Analysis as a dependency. I had to change some optimization pass ordering tests that were failing due to this. Please confirm that this is an inconsequential change.

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