Merged r15723, r15724, r15725, r15728 into trunk branch.

Synchronize Compare-Literal behavior in FullCodegen and Hydrogen

There is no undefined Literal.

Fix LiteralCompareTypeof breakage introduced in r15723

Better fix for LiteralCompareTypeof

BUG=chromium:260345
R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/19460006

git-svn-id: https://v8.googlecode.com/svn/trunk@15756 ce2b1a6d-e550-0410-aec6-3dcde31c8c00