MIPS: Fetch strictmode in the interceptor setter from the IC.
MIPS: Fetch strictmode in the interceptor setter from the IC.

Port r18140 (9d563402)

BUG=
R=gergely@homejinni.com

Review URL: https://codereview.chromium.org/96043003

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@18145 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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