[Sema] Correctly re-contextualize if
/switch
exprs in lazy vars
#70319
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With
if
/switch
expressions, we may now have local bindings within lazy initializers, and therefore need to ensure we correctly re-contextualize them. Adjust the walker to set the DeclContext for all decls it encounters, and make sure it handles some cases that the ASTWalker does not currently visit.rdar://119158202