Remove BP optimization.

CHANGELOG.md

@@ -1,6 +1,12 @@
 Rhai Release Notes
 ==================
 
+Version 1.14.0
+==============
+
+The code hacks that attempt to optimize branch prediction performance are removed because benchmarks do not show any material speed improvements.
+
+
 Version 1.13.0
 ==============
 

src/eval/expr.rs

@@ -431,6 +431,7 @@ impl Engine {
             #[cfg(not(feature = "no_object"))]
             Expr::Dot(..) => self.eval_dot_index_chain(global, caches, scope, this_ptr, expr, None),
 
+            #[allow(unreachable_patterns)]
             _ => unreachable!("expression cannot be evaluated: {:?}", expr),
         }
     }

src/eval/stmt.rs

@@ -946,6 +946,7 @@ impl Engine {
                 Ok(Dynamic::UNIT)
             }
 
+            #[allow(unreachable_patterns)]
             _ => unreachable!("statement cannot be evaluated: {:?}", stmt),
         }
     }