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* cgraph.h (verify_symtab, verify_symtab_node, verify_symtab_base): Declare. * cgraphunit.c (verify_cgraph_node): Verify symtab base; do not verify cgraph hash and same comdat groups. (cgraph_optimize); Verify symbol table. * ipa.c (cgraph_remove_unreachable_nodes): Verify symbol table. (dissolve_same_comdat_group_list): Work on symtab nodes. (function_and_variable_visibility): Dissolve variable same comdat group lists, too. * symtab.c: Include timevar.h (verify_symtab_base, verify_symtab_node, verify_symtab): New functions. From-SVN: r186578
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