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Add a note to the release not about a potentially breaking optimization

Description

Add a note to the release not about a potentially breaking optimization

This has come up twice already (once in pr42763 and once in the commit thread), so give warning of a new way in which UB can result in unexpected program behavior.

Details

Committed
reamesAug 5 2019, 3:34 PM
Parents
rL367940: [Sema] Add -Wpointer-compare
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