Stabilize escape analysis (without deopt)

src/compiler/escape-analysis-reducer.cc

Index: src/compiler/escape-analysis-reducer.cc
diff --git a/src/compiler/escape-analysis-reducer.cc b/src/compiler/escape-analysis-reducer.cc
index f833ebdf73060aaa86824a0e6a7444bb6fce77e3..d7b79b0733c68e74d756e1bbda623f819ed12de7 100644
--- a/src/compiler/escape-analysis-reducer.cc
+++ b/src/compiler/escape-analysis-reducer.cc
@@ -34,6 +34,8 @@ Reduction EscapeAnalysisReducer::Reduce(Node* node) {
       return ReduceFinishRegion(node);
     case IrOpcode::kReferenceEqual:
       return ReduceReferenceEqual(node);
+    case IrOpcode::kObjectIsSmi:
+      return ReduceObjectIsSmi(node);
     case IrOpcode::kStateValues:
     case IrOpcode::kFrameState:
       return ReplaceWithDeoptDummy(node);
@@ -146,6 +148,20 @@ Reduction EscapeAnalysisReducer::ReduceReferenceEqual(Node* node) {
 }
 
 
+Reduction EscapeAnalysisReducer::ReduceObjectIsSmi(Node* node) {
+  DCHECK_EQ(node->opcode(), IrOpcode::kObjectIsSmi);
+  Node* input = NodeProperties::GetValueInput(node, 0);
+  if (escape_analysis()->IsAllocation(input)) {
+    ReplaceWithValue(node, jsgraph()->FalseConstant());
+    if (FLAG_trace_turbo_escape) {
+      PrintF("Replaced ObjectIsSmi #%d with false\n", node->id());
+    }
+    return Replace(node);
+  }
+  return NoChange();
+}
+
+
 // TODO(sigurds): This is a temporary solution until escape analysis
 // supports deoptimization.
 Reduction EscapeAnalysisReducer::ReplaceWithDeoptDummy(Node* node) {