[PATCH] D134791: [clang] Unify Sema and CodeGen implementation of isFlexibleArrayMemberExpr

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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.

This does not impact __builtin_object_size interactions with FAM.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134791

Files:
  clang/include/clang/AST/Expr.h
  clang/lib/AST/Expr.cpp
  clang/lib/CodeGen/CGExpr.cpp
  clang/lib/Sema/SemaChecking.cpp

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