testsuite: Fix up test language requirements [PR94314]

With c++11 one gets:
Excess errors:
.../testsuite/g++.dg/pr94314-4.C:19:28: error: too many arguments to function 'void operator delete(void*)'
because C++ sized deallocation is a C++14 feature.

2020-04-17  Jakub Jelinek  <jakub@redhat.com>

	PR c++/94314
	* g++.dg/pr94314-4.C: Require c++14 rather than c++11.

gcc/testsuite/ChangeLog

+2020-04-17  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/94314
+	* g++.dg/pr94314-4.C: Require c++14 rather than c++11.
+
 2020-04-16  Peter Bergner  <bergner@linux.ibm.com>
 
 	PR rtl-optimization/93974

gcc/testsuite/g++.dg/pr94314-4.C

 /* PR c++/94314.  */
-/* { dg-do run { target c++11 } } */
+/* { dg-do run { target c++14 } } */
 /* { dg-options "-O2 -fdump-tree-cddce-details -fdelete-null-pointer-checks" } */
 
 int count = 0;