[Flang][OpenMP][Semantics] Modify errors to warnings for semantic checks in IS_DEVICE_PTR related to list-items being dummy arguments. (#74370)

Changed semantic check from giving error to giving a warning about
deprecation from OpenMP 5.2 and later about checks for dummy argument
list-items present on IS_DEVICE_PTR clause.

This P is blocker for
#71255

Author: raghavendhra

flang/lib/Semantics/check-omp-structure.cpp

@@ -2996,11 +2996,14 @@ void OmpStructureChecker::Enter(const parser::OmpClause::IsDevicePtr &x) {
             source.ToString());
       } else if (!(IsDummy(*symbol))) {
         context_.Say(itr->second->source,
-            "Variable '%s' in IS_DEVICE_PTR clause must be a dummy argument"_err_en_US,
+            "Variable '%s' in IS_DEVICE_PTR clause must be a dummy argument. "
+            "This semantic check is deprecated from OpenMP 5.2 and later."_warn_en_US,
             source.ToString());
       } else if (IsAllocatableOrPointer(*symbol) || IsValue(*symbol)) {
         context_.Say(itr->second->source,
-            "Variable '%s' in IS_DEVICE_PTR clause must be a dummy argument that does not have the ALLOCATABLE, POINTER or VALUE attribute."_err_en_US,
+            "Variable '%s' in IS_DEVICE_PTR clause must be a dummy argument "
+            "that does not have the ALLOCATABLE, POINTER or VALUE attribute. "
+            "This semantic check is deprecated from OpenMP 5.2 and later."_warn_en_US,
             source.ToString());
       }
     }

flang/test/Semantics/OpenMP/target01.f90

@@ -39,19 +39,19 @@ subroutine bar(b1, b2, b3)
   type(c_ptr), pointer :: b2
   type(c_ptr), value :: b3
 
-  !ERROR: Variable 'c' in IS_DEVICE_PTR clause must be a dummy argument
+  !WARNING: Variable 'c' in IS_DEVICE_PTR clause must be a dummy argument. This semantic check is deprecated from OpenMP 5.2 and later.
   !$omp target is_device_ptr(c)
     y = y + 1
   !$omp end target
-  !ERROR: Variable 'b1' in IS_DEVICE_PTR clause must be a dummy argument that does not have the ALLOCATABLE, POINTER or VALUE attribute.
+  !WARNING: Variable 'b1' in IS_DEVICE_PTR clause must be a dummy argument that does not have the ALLOCATABLE, POINTER or VALUE attribute. This semantic check is deprecated from OpenMP 5.2 and later.
   !$omp target is_device_ptr(b1)
     y = y + 1
   !$omp end target
-  !ERROR: Variable 'b2' in IS_DEVICE_PTR clause must be a dummy argument that does not have the ALLOCATABLE, POINTER or VALUE attribute.
+  !WARNING: Variable 'b2' in IS_DEVICE_PTR clause must be a dummy argument that does not have the ALLOCATABLE, POINTER or VALUE attribute. This semantic check is deprecated from OpenMP 5.2 and later.
   !$omp target is_device_ptr(b2)
     y = y + 1
   !$omp end target
-  !ERROR: Variable 'b3' in IS_DEVICE_PTR clause must be a dummy argument that does not have the ALLOCATABLE, POINTER or VALUE attribute.
+  !WARNING: Variable 'b3' in IS_DEVICE_PTR clause must be a dummy argument that does not have the ALLOCATABLE, POINTER or VALUE attribute. This semantic check is deprecated from OpenMP 5.2 and later.
   !$omp target is_device_ptr(b3)
     y = y + 1
   !$omp end target