export.sh: Make sure umask is not too restrictive (PR22742)

llvm-svn: 230977
diff --git a/llvm/utils/release/export.sh b/llvm/utils/release/export.sh
index 38e5a81..4da5fe4 100755
--- a/llvm/utils/release/export.sh
+++ b/llvm/utils/release/export.sh
@@ -79,5 +79,8 @@
     exit 1
 fi
 
+# Make sure umask is not overly restrictive.
+umask 0022
+
 export_sources
 exit 0