[PATCH] Fix PR21082 for C++

[Richard Guenther]

This patch fixes pr21082 for the trees the C++ frontend generates.
It folds &a[i]-&a[j] to i-j if there are ARRAY_REFs used.

Bootstrapped and tested on x86_64-unknown-linux with no regressions
for all languages except ada and treelang.

Ok for mainline?

Thanks,
Richard.
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