[llvm-commits] patch: teach dse about intrinsics

[Nick Lewycky]

This patch creates a utility class like an Operator (GEPOperator and 
friends) which represents instructions that clobber a pointer they're 
given. This groups StoreInst together with certain intrinsics and helps 
DSE handle them as a group.

This also marks our first optimization based on @llvm.lifetime.end.

Please review!

Nick
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