[OpenMP]Fix trivial build failure in MacOS

MacOS build of LLVM with OpenMP enabled fails with an error
that it doesn't know what std::abs is. Fix by including <cmath>
so that the relevant function declaration is included.

No functional change intended.

Reviewed By: tianshilei1992

Differential Revision: https://reviews.llvm.org/D150687

diff --git a/openmp/runtime/src/kmp_collapse.cpp b/openmp/runtime/src/kmp_collapse.cpp
index 4ae4789..f7b72a1 100644 (file)
--- a/openmp/runtime/src/kmp_collapse.cpp
+++ b/openmp/runtime/src/kmp_collapse.cpp
@@ -18,6 +18,8 @@
 #include "kmp_str.h"
 #include "kmp_collapse.h"
 
+#include <cmath>
+
 #if OMPT_SUPPORT
 #include "ompt-specific.h"
 #endif