Use a single Token::INIT for all variable initialization

src/parser.h

Index: src/parser.h
diff --git a/src/parser.h b/src/parser.h
index b674a9d2e2323d8014edceab988c52474e0c6ca3..749e0a6fe1fa9aa94184886c4fd99e987378f341 100644
--- a/src/parser.h
+++ b/src/parser.h
@@ -985,7 +985,6 @@ class Parser : public ParserBase<ParserTraits> {
     bool needs_init;
     int declaration_pos;
     int initialization_pos;
-    Token::Value init_op;
     Kind declaration_kind;
   };