[5.3] ReplaceOpaqueTypesWithUnderlyingTypes: Handle a type being "substituted" with itself. #31788
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…ed" with itself. SIL type lowering might have already substituted away an opaque type during a SIL substitution. Fixes rdar://problem/62072397.
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tkremenek
approved these changes
May 14, 2020
AnthonyLatsis
added
swift 5.3
🍒 release cherry pick
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5.3 cherry-pick of #31773
Explanation: Fixes a crash in some situations involving highly composed opaque return types.
Scope: Bug fix
Radar: rdar://62072397
Risk: Low
Testing: Full CI, local testing
Reviewed by: @aschwaighofer