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Commit 0f529998 authored by Duncan P. N. Exon Smith's avatar Duncan P. N. Exon Smith
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IR: Detect whether to call recalculateHash() via SFINAE, NFC 

Rather than relying on updating switch statements correctly, detect
whether `setHash()` exists in the subclass.  If so, call
`recalculateHash()` and `setHash(0)` appropriately.

llvm-svn: 226531
parent ee3626ec
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