Reland "[turbofan] inline %StringIteratorPrototype%.next in JSBuiltinReducer"

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 9466c57f750d64e9e4ae226327bc66d890fdcbda..03b64f073f468139149a2b7369e895cd3cccbdb8 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1234,6 +1234,27 @@ enum LiveEditFrameDropMode {
   LIVE_EDIT_CURRENTLY_SET_MODE
 };
 
+enum class UnicodeEncoding : uint8_t {
+  // Different unicode encodings in a |word32|:
+  UTF16,  // hi 16bits -> trailing surrogate or 0, low 16bits -> lead surrogate
+  UTF32,  // full UTF32 code unit / Unicode codepoint
+};
+
+inline size_t hash_value(UnicodeEncoding encoding) {
+  return static_cast<uint8_t>(encoding);
+}
+
+inline std::ostream& operator<<(std::ostream& os, UnicodeEncoding encoding) {
+  switch (encoding) {
+    case UnicodeEncoding::UTF16:
+      return os << "UTF16";
+    case UnicodeEncoding::UTF32:
+      return os << "UTF32";
+  }
+  UNREACHABLE();
+  return os;
+}
+
 }  // namespace internal
 }  // namespace v8