67576af5f2
1) BranchInstr::is_checked() was introduced back in the day when unoptimized IR could contain comparisons like RelationalOp - these days unoptimized IR can only contain StrictCompareInstr, other comparisons are represented as calls and can't be merged into the branch, making BranchInstr::is_checked() obsolete. 2) Constrained type support is no longer used: we deleted parts of the flow graph type propagator that propagated non-nullable types down from comparison with null (due to LICM issue). R=fschneider@google.com Review-Url: https://codereview.chromium.org/2640993003 .