Expose a lower bound of malloc'd memory via heap statistics

src/parsing/parser.cc

Index: src/parsing/parser.cc
diff --git a/src/parsing/parser.cc b/src/parsing/parser.cc
index 22f74807fbadfd382d89c298158638c4bbedcdbd..8128670128b5512505c3a1c21d017b57f9c059b9 100644
--- a/src/parsing/parser.cc
+++ b/src/parsing/parser.cc
@@ -4218,7 +4218,7 @@ FunctionLiteral* Parser::ParseFunctionLiteral(
       // temp_zone is deallocated. These objects are instead allocated in a
       // parser-persistent zone (see parser_zone_ in AstNodeFactory).
       {
-        Zone temp_zone;
+        Zone temp_zone(zone()->allocator());
         AstNodeFactory::BodyScope inner(factory(), &temp_zone, use_temp_zone);
 
         body = ParseEagerFunctionBody(function_name, pos, formals, kind,