mips: use putDReg/getDReg for ceil.l.d

For better clarity and consistency, use putDReg/getDReg instead of
putFReg/getFReg for ceil.l.d.
Non-functional change.


git-svn-id: svn://svn.valgrind.org/vex@2971 8f6e269a-dfd6-0310-a8e1-e2731360e62c
mips: add a missing break

Add a missing break found by IBM's BEAM checker and reported by Florian.


git-svn-id: svn://svn.valgrind.org/vex@2972 8f6e269a-dfd6-0310-a8e1-e2731360e62c