Don't take UnkownOSRValues into account when infering Phi's representation.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 6db297b681e5900697136aa7fcfd309bf00b906a..2b12bc7d20f2017a54a0133b14b48b46ac9f5eed 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -2257,6 +2257,38 @@ void HIn::PrintDataTo(StringStream* stream) {
 }
 
 
+Representation HPhi::InferredRepresentation() {
+  bool double_occurred = false;
+  bool int32_occurred = false;
+  for (int i = 0; i < OperandCount(); ++i) {
+    HValue* value = OperandAt(i);
+    if (value->IsUnknownOSRValue()) continue;
+    if (value->representation().IsDouble()) double_occurred = true;
+    if (value->representation().IsInteger32()) int32_occurred = true;
+    if (value->representation().IsTagged()) {
+      if (value->IsConstant()) {
+        HConstant* constant = HConstant::cast(value);
+        if (constant->IsConvertibleToInteger()) {
+          int32_occurred = true;
+        } else if (constant->HasNumberValue()) {
+          double_occurred = true;
+        } else {
+          return Representation::Tagged();
+        }
+      } else {
+        return Representation::Tagged();
+      }
+    }
+  }
+
+  if (double_occurred) return Representation::Double();
+
+  if (int32_occurred) return Representation::Integer32();
+
+  return Representation::None();
+}
+
+
 // Node-specific verification code is only included in debug mode.
 #ifdef DEBUG