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[Attributor] Deduce memory behavior of functions and arguments

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[Attributor] Deduce memory behavior of functions and arguments

Deduce the memory behavior, aka "read-none", "read-only", or
"write-only", for functions and arguments.

Reviewers: sstefan1, uenoku

Subscribers: hiraditya, bollu, jfb, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D67384

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