[AST] Fix a crash in UnqualifiedLookup #18279
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Add null type check for `Self` type in `UnqualifiedLookup`. It seems this doesn't happen in normal compilation. But when code-completion happens in inactive conditional compilation block, since surrounding context hasn't been typechecked, `Self` type can be null. rdar://problem/41234606
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Add null type check for
Selftype inUnqualifiedLookup. It seems this doesn't happen in normal compilation. But when code-completion happens in inactive conditional compilation block, since surrounding context hasn't been typechecked,Selftype can be null.rdar://problem/41234606