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I previously tried to clobber an array as a whole, but fell back on a loop due to issues with std::construct_at following the resolution of LWG3436. But the loop seems to make life hard for the optimizers and it occurs to me that for a one-element array we can just clobber the element type. This also fixes some xfails in Warray-bounds-20.C. gcc/cp/ChangeLog: * init.cc (build_new_1): Clobber a constant-bound array as a whole. gcc/testsuite/ChangeLog: * g++.dg/warn/Warray-bounds-20.C: Remove xfails, add diags.
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