serge-sans-paille 3460a5d795 [clang] Unify Sema and CodeGen implementation of isFlexibleArrayMemberExpr ...

Turn it into a single Expr::isFlexibleArrayMemberLike method, as discussed in

        https://discourse.llvm.org/t/rfc-harmonize-flexible-array-members-handling

Keep different behavior with respect to macro / template substitution, and
harmonize sharp edges: ObjC interface now behave as C struct wrt. FAM and
-fstrict-flex-arrays.

This does not impact __builtin_object_size interactions with FAM.

Differential Revision: https://reviews.llvm.org/D134791

2022-10-04 20:42:36 +02:00

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