[turbofan] Unwind and jump to the catch handler in the deoptimizer.

src/compiler/liveness-analyzer.h

Index: src/compiler/liveness-analyzer.h
diff --git a/src/compiler/liveness-analyzer.h b/src/compiler/liveness-analyzer.h
index 1e2f85b45e5f2fc7e646893baa52e7d7b166c28a..9b09724eefab02086bec129724008ca72968b531 100644
--- a/src/compiler/liveness-analyzer.h
+++ b/src/compiler/liveness-analyzer.h
@@ -85,6 +85,10 @@ class LivenessAnalyzerBlock {
   void Bind(int var) { entries_.push_back(Entry(Entry::kBind, var)); }
   void Checkpoint(Node* node) { entries_.push_back(Entry(node)); }
   void AddPredecessor(LivenessAnalyzerBlock* b) { predecessors_.push_back(b); }
+  LivenessAnalyzerBlock* GetPredecessor() {
+    DCHECK(predecessors_.size() == 1);
+    return predecessors_[0];
+  }
 
  private:
   class Entry {