Version 3.31.1 (based on 18cf6c9ac96a62ec320fc10d738d26fba784e2f4)

Fix has_constant_parameter_count() confusion in LReturn (Chromium issue 431602).

Performance and stability improvements on all platforms.

git-svn-id: https://v8.googlecode.com/svn/trunk@25275 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/trunk' into trunk