fix static ctor for non-trivial type (#2269)

test/util/test_control.cpp

@@ -25,14 +25,18 @@
 using namespace std;
 using namespace ngraph;
 
-static unordered_map<string, unordered_set<string>> s_blacklists;
+static unordered_set<string>& get_blacklist(const string& backend)
+{
+    static unordered_map<string, unordered_set<string>> s_blacklists;
+    return s_blacklists[backend];
+}
 
 string ngraph::prepend_disabled(const string& backend_name,
                                 const string& test_name,
                                 const string& manifest)
 {
     string rc = test_name;
-    unordered_set<string>& blacklist = s_blacklists[backend_name];
+    unordered_set<string>& blacklist = get_blacklist(backend_name);
     if (blacklist.empty() && !manifest.empty())
     {
         ifstream f(manifest);