[flang] Add default component initialization to some built-in types (#121416)

The standard requires EVENT_TYPE, LOCK_TYPE, NOTIFY_TYPE, and TEAM_TYPE
to have full default initialization for their nonallocatable private
components.

Author: klausler

flang/module/__fortran_builtins.f90

@@ -43,15 +43,15 @@
   end type
 
   type, public :: __builtin_event_type
-    integer(kind=int64), private :: __count
+    integer(kind=int64), private :: __count = -1
   end type
 
   type, public :: __builtin_notify_type
-    integer(kind=int64), private :: __count
+    integer(kind=int64), private :: __count = -1
   end type
 
   type, public :: __builtin_lock_type
-    integer(kind=int64), private :: __count
+    integer(kind=int64), private :: __count = -1
   end type
 
   type, public :: __builtin_ieee_flag_type
@@ -91,7 +91,7 @@
       __builtin_ieee_round_type(_FORTRAN_RUNTIME_IEEE_OTHER)
 
   type, public :: __builtin_team_type
-    integer(kind=int64), private :: __id
+    integer(kind=int64), private :: __id = -1
   end type
 
   integer, parameter, public :: __builtin_atomic_int_kind = selected_int_kind(18)

flang/test/Semantics/get_team.f90

@@ -10,6 +10,8 @@ program get_team_test
   type(team_type) :: result_team
   logical wrong_result_type, non_integer
 
+  result_team = team_type()
+
   !___ standard-conforming statement with no optional arguments present ___
   result_team = get_team()