Fix unused-but-set-variable warnings#1494
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Build with -Wunused-but-set-variable enabled (drop the suppression in CMakeLists.txt) and silence the four resulting warnings: - mark_weak_map_value: inline mr->map->is_weak instead of stashing the pointer in a local that is only consulted from an assert - num_keys_cmp / js_array_toSpliced: mark assert-only locals with __maybe_unused so they survive NDEBUG builds without warnings Verified with a clean build under gcc 13 and run-test262 -c tests.conf (0 failures).
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Build with -Wunused-but-set-variable enabled (drop the suppression in CMakeLists.txt) and silence the four resulting warnings:
Verified with a clean build under gcc 13 and run-test262 -c tests.conf (0 failures).