Missed memcpy & strlen/cat optimizations in LLVM

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Hi,

I found some cases which can be improved in LLVM optimizer:
https://godbolt.org/g/g5y9Qf

To summarize, folding memcpy calls could be interesting optimization to explore, but maybe not so trivially to implement.

Memcpy + strlen case should be easy to implement, I think I would look on it.

Thanks