Act on all remaining warnings about unused state vars.

compiler/add_heap_ops.m:
compiler/check_import_accessibility.m:
compiler/comp_unit_interface.m:
compiler/convert_import_use.m:
compiler/deforest.m:
compiler/dep_par_conj.m:
compiler/distance_granularity.m:
compiler/equiv_type.m:
compiler/generate_dep_d_files.m:
compiler/generate_mmakefile_fragments.m:
compiler/get_dependencies.m:
compiler/grab_modules.m:
compiler/higher_order.specialize_unify_compare.m:
compiler/jumpopt.m:
compiler/layout_out.m:
compiler/lco.m:
compiler/live_vars.m:
compiler/liveness.m:
compiler/llds_out_file.m:
compiler/make.build.m:
compiler/make.get_module_dep_info.m:
compiler/make.library_install.m:
compiler/make.module_target.m:
compiler/make.program_target.m:
compiler/make.track_flags.m:
compiler/make_hlds_passes.m:
compiler/make_module_file_names.m:
compiler/mercury_compile_front_end.m:
compiler/mercury_compile_llds_back_end.m:
compiler/mercury_compile_main.m:
compiler/mercury_compile_middle_passes.m:
compiler/ml_call_gen.m:
compiler/ml_closure_gen.m:
compiler/ml_code_gen.m:
compiler/ml_code_util.m:
compiler/ml_disj_gen.m:
compiler/ml_elim_nested.m:
compiler/ml_foreign_proc_gen.m:
compiler/ml_lookup_switch.m:
compiler/ml_switch_gen.m:
compiler/ml_unify_gen_deconstruct.m:
compiler/ml_unify_gen_test.m:
compiler/mlds_to_c_file.m:
compiler/mlds_to_target_util.m:
compiler/module_cmds.m:
compiler/opt_deps_spec.m:
compiler/optimize.m:
compiler/parse_dcg_goal.m:
compiler/parse_goal.m:
compiler/parse_item.m:
compiler/parse_module.m:
compiler/parse_string_format.m:
compiler/proc_gen.m:
compiler/prop_mode_constraints.m:
compiler/rbmm.points_to_analysis.m:
compiler/rbmm.region_analysis.m:
compiler/rbmm.region_transformation.m:
compiler/simplify_goal_disj.m:
compiler/ssdebug.m:
compiler/stack_opt.m:
compiler/string_switch.m:
compiler/switch_gen.m:
compiler/term_constr_build.m:
compiler/trace_gen.m:
compiler/tupling.m:
compiler/untupling.m:
compiler/write_deps_file.m:
deep_profiler/autopar_calc_overlap.m:
deep_profiler/autopar_find_best_par.m:
deep_profiler/html_format.m:
deep_profiler/startup.m:
profiler/mercury_profile.m:
profiler/propagate.m:
    Act on the new warnings. In a few cases, conform to the changes
    resulting from acting on the warnings in other modules.

browser/Mercury.options:
compiler/Mercury.options:
library/Mercury.options:
mdbcomp/Mercury.options:
ssdb/Mercury.options:
    Specify options for disabling the new warnings for modules
    where we (probably) won't want them.

configure.ac:
    Require the installed compiler to understand the options that
    we now reference in the Mercury.options files above.

tests/debugger/tailrec1.exp:
    Expect variable names for the middle versions of state vars
    using the new naming scheme.

tests/invalid/Mercury.options:
    Fix references to obsolete test names.

tests/warnings/Mercury.options:
    Avoid a test failure with intermodule optimization.

browser/Mercury.options

@@ -2,7 +2,7 @@
 # vim: ts=4 sw=4 expandtab
 #-----------------------------------------------------------------------------#
 # Copyright (C) 2002-2006, 2010 The University of Melbourne.
-# Copyright (C) 2015-2016, 2023-2024 The Mercury team.
+# Copyright (C) 2015-2016, 2023-2025 The Mercury team.
 # This file may only be copied under the terms of the GNU General
 # Public License - see the file COPYING in the Mercury distribution.
 #-----------------------------------------------------------------------------#
@@ -30,6 +30,8 @@ MCFLAGS-mdb.sized_pretty            += --no-optimize-constructor-last-call
 MCFLAGS-mdb.name_mangle             += --no-warn-inferred-erroneous
 MCFLAGS-mdb.interactive_query       += --no-warn-inferred-erroneous
 
+MCFLAGS-mdb.browser_info            += --no-warn-unneeded-final-statevars
+
 # XXX This line is needed so that `mmake --use-mmc-make libmer_browser'
 # passes `-lmer_mdbcomp' to `mmc --make' in the MLLIBS variable.
 LIBRARIES-mer_browser                   = mer_mdbcomp