LibJS: Clean up token constructor and use method instead for identifiers

Having two large constructor with just one parameter difference in the
middle seems quite dangerous so just do it with a method.

Userland/Libraries/LibJS/Lexer.cpp

@@ -768,28 +768,18 @@ Token Lexer::next()
         }
     }
 
-    if (identifier.has_value()) {
-        m_current_token = Token(
-            token_type,
-            token_message,
-            m_source.substring_view(trivia_start - 1, value_start - trivia_start),
-            m_source.substring_view(value_start - 1, m_position - value_start),
-            identifier.release_value(),
-            m_filename,
-            value_start_line_number,
-            value_start_column_number,
-            m_position);
-    } else {
-        m_current_token = Token(
-            token_type,
-            token_message,
-            m_source.substring_view(trivia_start - 1, value_start - trivia_start),
-            m_source.substring_view(value_start - 1, m_position - value_start),
-            m_filename,
-            value_start_line_number,
-            value_start_column_number,
-            m_position);
-    }
+    m_current_token = Token(
+        token_type,
+        token_message,
+        m_source.substring_view(trivia_start - 1, value_start - trivia_start),
+        m_source.substring_view(value_start - 1, m_position - value_start),
+        m_filename,
+        value_start_line_number,
+        value_start_column_number,
+        m_position);
+
+    if (identifier.has_value())
+        m_current_token.set_identifier_value(identifier.release_value());
 
     if constexpr (LEXER_DEBUG) {
         dbgln("------------------------------");

Userland/Libraries/LibJS/Token.h

@@ -193,19 +193,6 @@ public:
     {
     }
 
-    Token(TokenType type, String message, StringView trivia, StringView original_value, FlyString value, StringView filename, size_t line_number, size_t line_column, size_t offset)
-        : m_type(type)
-        , m_message(message)
-        , m_trivia(trivia)
-        , m_original_value(original_value)
-        , m_value(move(value))
-        , m_filename(filename)
-        , m_line_number(line_number)
-        , m_line_column(line_column)
-        , m_offset(offset)
-    {
-    }
-
     TokenType type() const { return m_type; }
     TokenCategory category() const;
     static TokenCategory category(TokenType);
@@ -239,6 +226,11 @@ public:
     String string_value(StringValueStatus& status) const;
     String raw_template_value() const;
 
+    void set_identifier_value(FlyString value)
+    {
+        m_value = move(value);
+    }
+
     bool is_identifier_name() const;
     bool trivia_contains_line_terminator() const;