+ i386: inline 64-bit multiplications if overflow checking is disabled and not optimizing for size. Rough testing on Core 2 Duo shows speed improvement by factor of 5, even despite inlined code does not check for zero upper dwords. 

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@26504 3ad0048d-3df7-0310-abae-a5850022a9f2