Stop providing branch prediction information

The __builtin_expect() can be used to provide the compiler with branch
prediction information.  The Gcc manual says[1] on the subject:

    In general, you should prefer to use actual profile feedback for
    this (-fprofile-arcs), as programmers are notoriously bad at
    predicting how their programs actually perform.

Stop using __builtin_expect() and ISC_LIKELY() and ISC_UNLIKELY() macros
to provide the branch prediction information as the performance testing
shows that named performs better when the __builtin_expect() is not
being used.

1. https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005fexpect

cocci/dns_message_create.spatch

@@ -66,15 +66,6 @@ expression V;
   dns_message_create(...);
 - CHECK(..., V);
 
-@@
-expression V;
-statement S;
-@@
-
-- V =
-  dns_message_create(...);
-- if (ISC_UNLIKELY(V != ISC_R_SUCCESS)) S
-
 @@
 expression V;
 @@

cocci/isc_buffer_allocate_never_fail.spatch

@@ -66,15 +66,6 @@ expression V;
   isc_buffer_allocate(...);
 - CHECK(..., V);
 
-@@
-expression V;
-statement S;
-@@
-
-- V =
-  isc_buffer_allocate(...);
-- if (ISC_UNLIKELY(V != ISC_R_SUCCESS)) S
-
 @@
 expression V;
 @@