i965, mesa: Use the new DECLARE_R[Z]ALLOC_CXX_OPERATORS macros.

i965, mesa: Use the new DECLARE_R[Z]ALLOC_CXX_OPERATORS macros.

These classes declared a placement new operator, but didn't declare a
delete operator.  Switching to the macro gives them a delete operator,
which probably is a good idea anyway.

This also eliminates a lot of boilerplate.

v2: Properly use RZALLOC in Mesa IR/TGSI translators.  Caught by Eric
    and Chad.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>