+ MIPS: Use INS and EXT instructions for bit manipulations when target CPU type is set to mips32r2.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25029 3ad0048d-3df7-0310-abae-a5850022a9f2
* MIPS: get rid of DIV and DIVU macros.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25030 3ad0048d-3df7-0310-abae-a5850022a9f2