Add missing #include, found by modules build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239587 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/llvm/ADT/Hashing.h b/include/llvm/ADT/Hashing.h
index 77e6d77b1b8e6b1ed2a0cfbf026c7b491d882d26..de56f91eddb154cc2c69c5dbae2b795f370aaaaa 100644 (file)
--- a/include/llvm/ADT/Hashing.h
+++ b/include/llvm/ADT/Hashing.h
@@ -53,6 +53,7 @@
 #include <cassert>
 #include <cstring>
 #include <iterator>
+#include <string>
 #include <utility>
 
 namespace llvm {