Martin Wille pointed out a missing anonymous namespace; fixed. Changed Jamfile and Jamfile.v2 so that we'd build the efficiency test in release mode always.

[SVN r31283]

test/Jamfile.v2

@@ -5,6 +5,6 @@ test-suite "parameter"
      [ run sfinae.cpp ]
      [ run macros.cpp ]
      [ run unnamed.cpp ]
-     [ run efficiency.cpp ]
+     [ run efficiency.cpp : : : <variant>release ]
      [ compile unwrap_cv_reference.cpp ]
   ;