[turbofan] Add support for eager/soft deoptimization reasons.

src/compiler/branch-elimination.cc

Index: src/compiler/branch-elimination.cc
diff --git a/src/compiler/branch-elimination.cc b/src/compiler/branch-elimination.cc
index b1967b896a8b893ce3434fae876a22b67dc283ee..9b36eb106865c52aa1a38dca49b28b497f451a6f 100644
--- a/src/compiler/branch-elimination.cc
+++ b/src/compiler/branch-elimination.cc
@@ -83,6 +83,7 @@ Reduction BranchElimination::ReduceDeoptimizeConditional(Node* node) {
   DCHECK(node->opcode() == IrOpcode::kDeoptimizeIf ||
          node->opcode() == IrOpcode::kDeoptimizeUnless);
   bool condition_is_true = node->opcode() == IrOpcode::kDeoptimizeUnless;
+  DeoptimizeReason reason = DeoptimizeReasonOf(node->op());
   Node* condition = NodeProperties::GetValueInput(node, 0);
   Node* frame_state = NodeProperties::GetValueInput(node, 1);
   Node* effect = NodeProperties::GetEffectInput(node);
@@ -102,8 +103,9 @@ Reduction BranchElimination::ReduceDeoptimizeConditional(Node* node) {
       // with the {control} node that already contains the right information.
       ReplaceWithValue(node, dead(), effect, control);
     } else {
-      control = graph()->NewNode(common()->Deoptimize(DeoptimizeKind::kEager),
-                                 frame_state, effect, control);
+      control =
+          graph()->NewNode(common()->Deoptimize(DeoptimizeKind::kEager, reason),
+                           frame_state, effect, control);
       // TODO(bmeurer): This should be on the AdvancedReducer somehow.
       NodeProperties::MergeControlToEnd(graph(), common(), control);
       Revisit(graph()->end());