[PATCH] fix #69277 - [6 Regression] ICE mangling a flexible array member

[Martin Sebor]

c++/69277 reports an ICE when mangling a template specialization
involving flexible array member.  Debugging the problem revealed
that GCC (prior to the ICE), due to treating flexible array
members the same as zero-length arrays, produced the wrong mangling
for the former.

The attached patch fixes the ICE and also corrects the mangling
(which now also matches Clang's).

Tested on x86_64.

Martin
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