fix: dont manually call valgrind macros

Author: not-matthias

core/include/measurement.hpp

@@ -44,19 +44,11 @@ inline void measurement_set_metadata() {
 }
 
 __attribute__((always_inline)) inline void measurement_start() {
-  // Keep the callgrind macros here, so that they are properly inlined.
-  // Otherwise, we have an additional function call overhead to the
-  // instrument-hooks library.
-  CALLGRIND_ZERO_STATS;
-  CALLGRIND_START_INSTRUMENTATION;
-
   instrument_hooks_start_benchmark(get_hooks());
 }
 
 __attribute__((always_inline)) inline void measurement_stop(
     const std::string& name) {
-  CALLGRIND_STOP_INSTRUMENTATION;
-
   instrument_hooks_stop_benchmark(get_hooks());
 
 #ifdef _WIN32