ARM: Optimize truncating division and fix sim

Optimize code generated for DivI Lithium instruction when handling division
where the result is int32. Also, fix the ARM simulator to give the correct
answer for kMinInt / -1.

TEST=Division tests added to test-assembler-arm.cc
BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/102623003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18445 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
MIPS: Avoid unnecessary branches in array constructor stubs.

Port r18427 (4db045a)

BUG=
R=plind44@gmail.com

Review URL: https://codereview.chromium.org/107003008

Patch from Balazs Kilvady <kilvadyb@homejinni.com>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@18446 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/master'