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Ada bootstrap has been broken by the SCC value numbering patch too (this is PR tree-optimization/32589) but this might be due to a latent problem.
In the FRE dump:
RHS &p__name_buffer[1]{lb: 1 sz: 1} + n_32 simplified to &p__name_buffer[(<unnamed-signed:32>) MAX_EXPR <D.738_31, 0> + 1]{lb: 1 sz: 1} has constants 0
and the latter expression is caught by the GIMPLE expression verifier:
error: invalid array index (<unnamed-signed:32>) MAX_EXPR <D.738_31, 0> + 1;
tmp_1 = MAX_EXPR <D.738_31, 0>; tmp_2 = (<unnamed-signed:32>)tmp_1; tmp_3 = tmp_2 + 1; &p_name_buffer[tmp3]
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