Actually use loopIterations

benchmarks/bench_volatile_loop.cpp

@@ -1,10 +1,10 @@
 #include <nanobench.h>
 
 int main() {
-  constexpr int loopIterations = 1200;
+  constexpr int loopIterations = 800;
   ankerl::nanobench::Bench().run(
       "volatile loop to " + std::to_string(loopIterations), [&] {
-        for (volatile int i = 0; i < 1200; i = i + 1)
+        for (volatile int i = 0; i < loopIterations; i = i + 1)
           ;
       });