* SPARC: r26561 caused a_op_const_reg_reg used for zero-extending 8-bit values to be optimized away. Fixed by replacing it with an explicit instruction.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26566 3ad0048d-3df7-0310-abae-a5850022a9f2