Fix bogus error on allocator for array type with Dynamic_Predicate

This is a regression present on all active branches: the compiler gives
a bogus error on an allocator for an unconstrained array type declared
with a Dynamic_Predicate because Apply_Predicate_Check is invoked directly
on a subtype reference, which it cannot handle.

This moves the check to the resulting access value (after dereference) like
in Expand_Allocator_Expression.

gcc/ada/
	PR ada/113979
	* exp_ch4.adb (Expand_N_Allocator): In the subtype indication case,
	call Apply_Predicate_Check on the resulting access value if needed.

gcc/testsuite/
	* gnat.dg/predicate15.adb: New test.

1 files changed, 15 insertions, 0 deletions

diff --git a/gcc/testsuite/gnat.dg/predicate15.adb b/gcc/testsuite/gnat.dg/predicate15.adb
new file mode 100644
index 0000000..cf9e1d9
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/predicate15.adb
@@ -0,0 +1,15 @@
+-- { dg-do compile }
+-- { dg-options "-gnata" }
+
+procedure Predicate15 is
+
+   type Grid is array (Positive range <>) of Integer with
+      Dynamic_Predicate => Grid'First = 1;
+
+   type Grid_Ptr is access Grid;
+
+   Data : Grid_Ptr := new Grid (1 .. 10);
+
+begin
+   null;
+end;