(This is marked as P1 regression)

Since the structure handling updates, a hash is now used to find expressions which are identical;
unfortunately, this mishandles 'volatile' vars as expressions involving them are not regarded
as identical. This leads to spurious *multiple* 'map(struct:x' that later causes an ICE.
(For details, see also the PR, https://gcc.gnu.org/PR108545 )

OK for mainline?

Tobias
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