[turbofan] Introduce a SpeculativeToNumber operator.

src/compiler/bytecode-graph-builder.h

Index: src/compiler/bytecode-graph-builder.h
diff --git a/src/compiler/bytecode-graph-builder.h b/src/compiler/bytecode-graph-builder.h
index 9b5e8069ef839ddfaf0099c104873fa41c547a15..0948015d2b6478c2aea917987ba6784d1af6ea6a 100644
--- a/src/compiler/bytecode-graph-builder.h
+++ b/src/compiler/bytecode-graph-builder.h
@@ -180,6 +180,7 @@ class BytecodeGraphBuilder {
   // any other invocation of {NewNode} would do.
   Node* TryBuildSimplifiedBinaryOp(const Operator* op, Node* left, Node* right,
                                    FeedbackSlot slot);
+  Node* TryBuildSimplifiedToNumber(Node* input, FeedbackSlot slot);
   Node* TryBuildSimplifiedLoadNamed(const Operator* op, Node* receiver,
                                     FeedbackSlot slot);
   Node* TryBuildSimplifiedLoadKeyed(const Operator* op, Node* receiver,