Make DeltaBlue performance more stable by ignoring type feedback that
tells us that a map can transition to another map when we are generating code for load operations. This may cause us to deopt if the same routine is seeing different maps caused by branching in constructors. If so, I have a different change that is around 100 times more complicated that lets us generated Crankshaft code for negative lookups. Review URL: https://chromiumcodereview.appspot.com/10306010 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11524 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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