C++11: Use sized enums (+4% performance).

src/V3Task.cpp

@@ -321,7 +321,7 @@ private:
     AstUser2InUse m_inuser2;
 
     // TYPES
-    enum InsertMode {
+    enum InsertMode : uint8_t {
         IM_BEFORE,  // Pointing at statement ref is in, insert before this
         IM_AFTER,  // Pointing at last inserted stmt, insert after
         IM_WHILE_PRECOND  // Pointing to for loop, add to body end