MIPS: Fix bug in elements transition code for smi to double transitions.
MIPS: Fix bug in elements transition code for smi to double transitions.

This fixes intermittent sin-cos test failures when corrupted values are returned
for referent sin and cos functions in test which require factorial value
to be calculated.

TEST=mjsunit/sin-cos
BUG=
R=balazs.kilvady@imgtec.com

Review URL: https://codereview.chromium.org/885923004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#26365}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh