[SIL Optimizer] Determine feasibility of dynamic casts between tuple types #4901
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…types. The SIL optimizer logic that determined feasability of dynamic casts completely ignored tuple types, therefore assuming that they would always fail. Check for structural identity, ignoring adding/removing labels. Fixes rdar://problem/28121915. (cherry picked from commit 8da7d7c)
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@swift-ci please test |
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@swiftix please review |
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@DougGregor LGTM! Thanks for fixing this! |
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The SIL optimizer logic that determined feasability of dynamic casts
completely ignored tuple types, therefore assuming that they would
always fail. Check for structural identity, ignoring adding/removing
labels.
Resolves rdar://problem/28121915.