Revert r20476.

Reason for revert: crashes arm64.debug cctest

Fatal error in ../src/hydrogen-instructions.h, line 2968
CHECK(value->IsCheckHeapObject()) failed

Fixed environment assignment for LCheckNonSmi.

TBR=svenpanne@chromium.org
BUG=

Review URL: https://codereview.chromium.org/223873003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20484 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'