[Buf] remove append_inplace hack; ordinary concatenation performs nea…

…rly equally well, so this was a case of premature optimization. Go figure.

src/core/Buf.pm

@@ -49,18 +49,6 @@ class Buf does Positional {
             nqp::unbox_s $encoding.lc
         );
     }
-
-    # append_inplace is a big hack, but seems to be necessary
-    # performance wise for reading binary data in chunks
-    method append_inplace(Buf:D: Buf:D $other) {
-        my Mu $other_buf := nqp::getattr(pir::perl6_decontainerize__PP($other), Buf, '$!buffer');
-        pir::set__vPs($!buffer, nqp::concat_s(
-                  $!buffer.get_string('binary'),
-                $other_buf.get_string('binary')
-            )
-        );
-        self;
-    }
 }
 
 multi infix:<eqv>(Buf:D $a, Buf:D $b) {