[turbofan] Introduce a SpeculativeToNumber operator.

src/compiler/typed-optimization.h

Index: src/compiler/typed-optimization.h
diff --git a/src/compiler/typed-optimization.h b/src/compiler/typed-optimization.h
index 93de680d4f0898e2f23e0d2cc8a021d9d9159be1..ca7fd961d1185300c45faf51c09e101870a053a5 100644
--- a/src/compiler/typed-optimization.h
+++ b/src/compiler/typed-optimization.h
@@ -52,6 +52,7 @@ class V8_EXPORT_PRIVATE TypedOptimization final
   Reduction ReducePhi(Node* node);
   Reduction ReduceReferenceEqual(Node* node);
   Reduction ReduceSelect(Node* node);
+  Reduction ReduceSpeculativeToNumber(Node* node);
 
   CompilationDependencies* dependencies() const { return dependencies_; }
   Factory* factory() const;