Add missing #include, found by modules build.

llvm-svn: 239587

diff --git a/llvm/include/llvm/ADT/Hashing.h b/llvm/include/llvm/ADT/Hashing.h
index 77e6d77..de56f91 100644 (file)
--- a/llvm/include/llvm/ADT/Hashing.h
+++ b/llvm/include/llvm/ADT/Hashing.h
@@ -53,6 +53,7 @@
 #include <cassert>
 #include <cstring>
 #include <iterator>
+#include <string>
 #include <utility>
 
 namespace llvm {