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Reduce memory allocation in stable_sort/inplace_merge algorithms to what is needed by the implementation. Co-authored-by: John Chang <john.chang@samba.tv> libstdc++-v3/ChangeLog: PR libstdc++/83938 * include/bits/stl_tempbuf.h (get_temporary_buffer): Change __len computation in the loop to avoid truncation. * include/bits/stl_algo.h: (__inplace_merge): Take temporary buffer length from smallest range. (__stable_sort): Limit temporary buffer length. * testsuite/25_algorithms/inplace_merge/1.cc (test4): New. * testsuite/performance/25_algorithms/stable_sort.cc: Test stable_sort under different heap memory conditions. * testsuite/performance/25_algorithms/inplace_merge.cc: New test.
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