MIPS64: Fix move operations from coprocessor in simulator.

This resolves calculation errors for trigonometric functions.

TEST=test262/S15.8.2.7_A6.js
BUG=
R=jkummerow@chromium.org, paul.lind@imgtec.com

Review URL: https://codereview.chromium.org/558163006

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24013 ce2b1a6d-e550-0410-aec6-3dcde31c8c00