* MIPS: generate real instructions, not macros, for comparisons with $zero.
* g_concatcopy, g_concatcopy_unaligned: call a_cmp_reg_reg_label instead of duplicating code.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24895 3ad0048d-3df7-0310-abae-a5850022a9f2