MIPS64: Fix bugs after hole-nan value change.
MIPS64: Fix bugs after hole-nan value change.

TEST=mjsunit/regress/regress-undefined-nan{2,3}, mjsunit/elements-transition, mjsunit/elide-double-hole-check-*
BUG=

Review URL: https://codereview.chromium.org/892853002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#26374}

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