Add 'string-tries-sml/' from commit 'd056e08ce768e014ab409c7f63e8fd0adfc1dff2'

git-subtree-dir: string-tries-sml
git-subtree-mainline: dba78da7ec
git-subtree-split: d056e08ce7

string-tries-sml/bench/build-get-prefix-bro-tree.mlb

@@ -0,0 +1,10 @@
+$(SML_LIB)/basis/basis.mlb
+
+ann
+  "allowVectorExps true"
+in
+  words.sml
+end
+
+bro-tree.sml
+build-get-prefix-bro-tree.sml