Remove transpose_reg of Vec2d's

It is pretty useless anyway and it breaks with operator counting
overloaded types.

dune/perftool/sumfact/transposereg.hh

@@ -3,20 +3,6 @@
 
 #include<dune/perftool/common/vectorclass.hh>
 
-
-#if MAX_VECTOR_SIZE >= 128
-
-void transpose_reg(Vec2d& a0, Vec2d& a1)
-{
-  Vec2d b0, b1;
-  b0 = blend2d<0,2>(a0, a1);
-  b1 = blend2d<1,3>(a0, a1);
-  a0 = b0;
-  a1 = b1;
-}
-
-#endif
-
 #if MAX_VECTOR_SIZE >= 256
 
 void transpose_reg(Vec4d& a0, Vec4d& a1, Vec4d& a2, Vec4d& a3)