[stubs] Port NumberToString stub to TF

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 7cb65a71cb9b3f2749a750f978dca9c70bb4296a..5ee97487aa5d057eba9e5161cc9ca338b6ccc296 100644
--- a/src/code-stub-assembler.h
+++ b/src/code-stub-assembler.h
@@ -521,6 +521,8 @@ class CodeStubAssembler : public compiler::CodeAssembler {
   // Convert a String to a Number.
   compiler::Node* StringToNumber(compiler::Node* context,
                                  compiler::Node* input);
+  compiler::Node* NumberToString(compiler::Node* context,
+                                 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.