LibcBenchmark.h - add missing implicit cmath header dependency. NFCI.

Noticed while investigating if we can remove an unnecessary MathExtras.h include from SmallVector.h

diff --git a/libc/benchmarks/LibcBenchmark.h b/libc/benchmarks/LibcBenchmark.h
index af6173a..b459eb9 100644 (file)
--- a/libc/benchmarks/LibcBenchmark.h
+++ b/libc/benchmarks/LibcBenchmark.h
@@ -36,6 +36,7 @@
 #include "llvm/ADT/SmallVector.h"
 #include <array>
 #include <chrono>
+#include <cmath>
 #include <cstdint>
 
 namespace llvm {