[builtins] Migrate ToNumber to TurboFan.

src/code-stub-assembler.h

Index: src/code-stub-assembler.h
diff --git a/src/code-stub-assembler.h b/src/code-stub-assembler.h
index b217353f7d47f8cd884e2d220d27681e37aa3125..7252a1dcbb3debb6434a3efcb4456c6e17ac3417 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -431,6 +431,11 @@ class CodeStubAssembler : public compiler::CodeAssembler {
                                  compiler::Node* input);
   // Convert an object to a name.
   compiler::Node* ToName(compiler::Node* context, compiler::Node* input);
+  // Convert a Non-Number object to a Number.
+  compiler::Node* NonNumberToNumber(compiler::Node* context,
+                                    compiler::Node* input);
+  // Convert any object to a Number.
+  compiler::Node* ToNumber(compiler::Node* context, compiler::Node* input);
 
   // Returns a node that contains a decoded (unsigned!) value of a bit
   // field |T| in |word32|. Returns result as an uint32 node.