This patch restores bootstrap when using g++ 4.8 as a host compiler.
Returning a std::unique_ptr requires a std::move on C++ compilers
(pre-C++17) that don't guarantee copy elision/return value optimization.

Bootstrapped on x86_64-pc-linux-gnu using both gcc 4.8.5 (system) and
gcc 10.2.1 (using "scl enable devetoolset-10") as host compilers.
Ok for mainline?


2024-06-07  Roger Sayle  <roger@nextmovesoftware.com>

gcc/analyzer/ChangeLog
        * constraint-manager.cc (equiv_class::make_dump_widget): Use
        std::move to return a std::unique_ptr.
        (bounded_ranges_constraint::make_dump_widget): Likewise.
        (constraint_manager::make_dump_widget): Likewise.
        * program_state.cc (sm_state_map::make_dump_widget): Likewise.
        (program_state::make_dump_widget): Likewise.
        * region-model.cc (region_to_value_map::make_dump_widget): Likewise.
        (region_model::make_dump_widget): Likewise.
        * region.cc (region::make_dump_widget): Likewise.
        * store.cc (binding_cluster::make_dump_widget): Likewise.
        (store::make_dump_widget): Likewise.
        * svalue.cc (svalue::make_dump_widget): Likewise.

Thanks in advance,
Roger
--