[libc] Polish GPU benchmarking (#153900) This patch provides cleanups and improvements for the GPU benchmarking infrastructure. The key changes are: - Fix benchmark convergence bug: Round up the scaled iteration count (ceil) to ensure it grows properly. The previous truncation logic causes the iteration count to get stuck. - Resolve remaining compiler warning. - Remove unused `BenchmarkLogger` files: This is dead code that added maintenance and cognitive overhead without providing functionality. - Improve build hygiene: Clean up headers and CMake dependencies to strictly follow the 'include what you use' (IWYU) principle.
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