mips32/mips64: tests for FCSR.

Change the existing tests to print the value of the FCSR
register after the mips fpu instruction is executed.
Add tests that are testing the value of FCSR register.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13560 a5019735-40e9-0310-863c-91ae7b9d1cf9