MIPS RTL:
+ fixed missing result assignments in SetRoundMode and SetExceptionMask.
* GetRoundMode: provide correct mapping from FSR bits to TRoundingMode.
* SetExceptionMask: simplified.


git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@25079 3ad0048d-3df7-0310-abae-a5850022a9f2