+ MIPS: implemented direct 32x32 to 64 bit multiplication.

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24436 3ad0048d-3df7-0310-abae-a5850022a9f2
* arm thumb: do not cause bxx getting too long ranges when inserting constant blocks

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24437 3ad0048d-3df7-0310-abae-a5850022a9f2