[turbofan] Consume SignedSmall feedback for number operations.

src/compiler/representation-change.h

Index: src/compiler/representation-change.h
diff --git a/src/compiler/representation-change.h b/src/compiler/representation-change.h
index a9fc283c7e101c2d1031cfde0ed23fdaee620c84..80d5a73bd9f299c321f005883deb91993ede4811 100644
--- a/src/compiler/representation-change.h
+++ b/src/compiler/representation-change.h
@@ -74,12 +74,19 @@ class Truncation final {
   static bool LessGeneral(TruncationKind rep1, TruncationKind rep2);
 };
 
-enum class TypeCheckKind : uint8_t { kNone, kSigned32, kNumberOrOddball };
+enum class TypeCheckKind : uint8_t {
+  kNone,
+  kSignedSmall,
+  kSigned32,
+  kNumberOrOddball
+};
 
 inline std::ostream& operator<<(std::ostream& os, TypeCheckKind type_check) {
   switch (type_check) {
     case TypeCheckKind::kNone:
       return os << "None";
+    case TypeCheckKind::kSignedSmall:
+      return os << "SignedSmall";
     case TypeCheckKind::kSigned32:
       return os << "Signed32";
     case TypeCheckKind::kNumberOrOddball:
@@ -131,6 +138,10 @@ class UseInfo {
   }
 
   // Possibly deoptimizing conversions.
+  static UseInfo CheckedSignedSmallAsWord32() {
+    return UseInfo(MachineRepresentation::kWord32, Truncation::Any(),
+                   TypeCheckKind::kSignedSmall);
+  }
   static UseInfo CheckedSigned32AsWord32() {
     return UseInfo(MachineRepresentation::kWord32, Truncation::Any(),
                    TypeCheckKind::kSigned32);