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David Blaikie
f21a88cbf6
IR Linking: Support merging Warning+Max module metadata flags
Summary: Debug Info Version was changed to use "Max" instead of "Warning" per the original design intent - but this maxes old/new IR unlinkable, since mismatched merge styles are a linking failure. It seems possible/maybe reasonable to actually support the combination of these two flags: Warn, but then use the maximum value rather than the first value/earlier module's value. Reviewers: tejohnson Differential Revision: https://reviews.llvm.org/D74257
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