Add support for nested ASTScopes inside of macro expansions. #65403
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Before this patch the parents of SILDebugScopes representing macro expansions were missing the inlinedAt field, which resulted in incorrent LLVM IR being produced. This is fixed by first computing the inlined call site for a macro expansion and then computing the nested SILDebugScope for the ASTScope of the expanded nodes; adding the inlinedAt field to all of levels of parent scopes.
rdar://108323748
Cherry pick of #65402.