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Commit a5a8546a authored by Philip Reames's avatar Philip Reames
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[AST] Mark invariant.starts as being readonly 

These intrinsics are modelled as writing for control flow purposes, but they don't actually write to any location. Marking these - as we did for guards - allows LICM to hoist loads out of loops containing invariant.starts.

Differential Revision: https://reviews.llvm.org/D50861

llvm-svn: 340245
parent 578c64da
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