[PATCH 0/2]PR101832: Handle component_ref to a structure/union field including flexible array member for builtin_object_size

[Qing Zhao via Gcc-patches]

This is the patch for PR101832, to fix builtin_object_size to
correctly handle component_ref to a structure/union field that
includes a flexible array member.

also includes a documentation update for the GCC extension on embedding
a structure/union with flexible array member into another structure.

bootstrapped and regression tested on aarch64 and x86.

Okay for commit?

thanks.

Qing