Version 3.22.18

Add tool to visualize machine code/lithium.

Handle misaligned loads and stores in load elimination. Do not track misaligned loads and be conservative about invalidating misaligned stores. (issue 2934)

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@17310 ce2b1a6d-e550-0410-aec6-3dcde31c8c00