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backport "[InstCombine] Transform !range metadata to !nonnull when combining loads" #55
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When combining an integer load with !range metadata that does not include 0 to a pointer load, make sure emit !nonnull metadata on the newly-created pointer load. This prevents the !nonnull metadata from being dropped during a ptrtoint/inttoptr pair. This fixes PR30597. Patch by Ariel Ben-Yehuda! Differential Revision: https://reviews.llvm.org/D25215 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283836 91177308-0d34-0410-b5e6-96231b3b80d8
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cc rust-lang/rust#36920. No need to backport to beta.