AST: Fix memory corruption in TypeAliasType::get() #26807
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The type alias might not have a generic signature set yet, so we have to use the generic signature in the substitution map. Yay for un-request-ified decl checking! Caught by ASAN - <rdar://problem/54637931>.
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The type alias might not have a generic signature set yet, so we have to
use the generic signature in the substitution map.
Yay for un-request-ified decl checking!
Caught by ASAN - rdar://problem/54637931.