Support reverse atom_chars/2 in WAM-C - #4268
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Adds
atom_chars(-Atom,+Chars)for finite, fully bound proper lists of single Unicode scalar character atoms. The runtime accepts both WAM list layouts, preserves trail/backtracking behavior, and reports unsupported shapes explicitly. Generated-C/SWI coverage includes ASCII, empty, Unicode, compiled-list rollback, and malformed inputs.Validation:
test_wam_c_atom_chars.pl,test_wam_c_atom_codes.pl,test_wam_c_char_code.pl, andtest_wam_c_target.plpass;git diff --checkis clean.