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Backport a fix for duplicate debug data errors #93
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Some passes might duplicate calls to llvm.dbg.declare creating duplicate frame index expression which currently trigger an assertion which is meant to catch erroneous, overlapping fragment declarations. But identical frame index expressions are just redundant and don't actually conflict with each other, so we can be more lenient and just ignore the duplicates. Reviewers: aprantl, rnk Subscribers: llvm-commits, JDevlieghere Differential Revision: https://reviews.llvm.org/D38540
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Differential Revision: https://reviews.llvm.org/D38540
Fixes problems seen in rust-lang/rust#44573