Fix primitives benchmark code

[gigony]

The pointer variable is used after releasing memory with free(), which is a bug that needs to be addressed.

Without this fix, the benchmark code may fail to build or run correctly, resulting in the following error (link)

In function 'void benchmark::DoNotOptimize(Tp&) [with Tp = char*]',
    inlined from 'void string_strcpy(benchmark::State&)' at /opt/conda/conda-bld/work/benchmarks/primitives.cpp:110:33:
/opt/conda/conda-bld/work/build-release/_deps/deps-googlebenchmark-src/src/../include/benchmark/benchmark.h:322:3: error: pointer used after 'void free(void*)' [-Werror=use-after-free]
  322 |   asm volatile("" : "+m,r"(value) : : "memory");
      |   ^~~

It seems that the updated version of GCC is now capable of detecting this potential issue.

This commit resolves the issue by ensuring the memory is released only after benchmark::DoNotOptimize() is called.

This PR handles a build issue related to #811

• Use GCC 13 in CUDA 12 conda builds. #811

[jakirkham]

/merge