Merged r14512, r14621, r14828 into 3.18 branch.

MIPS: Fix mjsunit/harmony/generators-iteration test failure.

MIPS: Fix NaN handling for start and end indexes in ArraySlice.

MIPS: Fix unaligned address of double.

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/15812003

git-svn-id: https://v8.googlecode.com/svn/branches/3.18@14835 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merged r14734, r14777 into 3.18 branch.

Add regression test for fix from r14732.

Fix embedded new-space pointer in LCmpObjectEqAndBranch.

R=jkummerow@chromium.org
BUG=chromium:242502,chromium:240032

Review URL: https://codereview.chromium.org/15647005

git-svn-id: https://v8.googlecode.com/svn/branches/3.18@14837 ce2b1a6d-e550-0410-aec6-3dcde31c8c00