testsuite: Add -fchecking to dg-ice tests

In --enable-checking=release builds (which is the default on release
branches), I'm getting various extra FAILs that don't appear in
--enable-checking=yes builds.

XPASS: g++.dg/cpp0x/constexpr-52830.C  -std=c++14 (internal compiler error)
FAIL: g++.dg/cpp0x/constexpr-52830.C  -std=c++14 (test for excess errors)
XPASS: g++.dg/cpp0x/constexpr-52830.C  -std=c++17 (internal compiler error)
FAIL: g++.dg/cpp0x/constexpr-52830.C  -std=c++17 (test for excess errors)
XPASS: g++.dg/cpp0x/constexpr-52830.C  -std=c++2a (internal compiler error)
FAIL: g++.dg/cpp0x/constexpr-52830.C  -std=c++2a (test for excess errors)
FAIL: g++.dg/cpp0x/vt-88982.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/cpp0x/vt-88982.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/cpp0x/vt-88982.C  -std=c++2a (test for excess errors)
FAIL: g++.dg/cpp1y/auto-fn61.C  -std=c++14 (test for excess errors)
FAIL: g++.dg/cpp1y/auto-fn61.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/cpp1y/auto-fn61.C  -std=c++2a (test for excess errors)
FAIL: g++.dg/cpp1z/constexpr-lambda26.C  -std=c++17 (test for excess errors)
FAIL: g++.dg/cpp1z/constexpr-lambda26.C  -std=c++2a (test for excess errors)
FAIL: g++.dg/cpp2a/nontype-class39.C  -std=c++2a (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-1.c  -std=c++14 (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-1.c  -std=c++17 (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-1.c  -std=c++2a (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-1.c  -std=c++98 (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-2.c  -std=c++14 (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-2.c  -std=c++17 (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-2.c  -std=c++2a (test for excess errors)
FAIL: c-c++-common/goacc/kernels-decompose-ice-2.c  -std=c++98 (test for excess errors)

These are tests that have dg-ice and most of those ICEs are checking ICEs
which go away in release checking when -fno-checking is the default.

The following patch adds -fchecking option to those.

2021-04-21  Jakub Jelinek  <jakub@redhat.com>

	* g++.dg/cpp1z/constexpr-lambda26.C: Add dg-additional-options
	-fchecking.
	* g++.dg/cpp1y/auto-fn61.C: Likewise.
	* g++.dg/cpp2a/nontype-class39.C: Likewise.
	* g++.dg/cpp0x/constexpr-52830.C: Likewise.
	* g++.dg/cpp0x/vt-88982.C: Likewise.
	* c-c++-common/goacc/kernels-decompose-ice-1.c: Add -fchecking to
	dg-additional-options.
	* c-c++-common/goacc/kernels-decompose-ice-2.c: Likewise.

--- gcc/testsuite/c-c++-common/goacc/kernels-decompose-ice-1.c
+++ gcc/testsuite/c-c++-common/goacc/kernels-decompose-ice-1.c
@@ -1,7 +1,7 @@
 /* Test OpenACC 'kernels' construct decomposition.  */
 
 /* { dg-additional-options "-fopt-info-omp-all" } */
-/* { dg-additional-options "--param=openacc-kernels=decompose" } */
+/* { dg-additional-options "-fchecking --param=openacc-kernels=decompose" } */
 /* { dg-ice "TODO" }
    { dg-prune-output "during GIMPLE pass: omplower" } */
 
--- gcc/testsuite/c-c++-common/goacc/kernels-decompose-ice-2.c
+++ gcc/testsuite/c-c++-common/goacc/kernels-decompose-ice-2.c
@@ -1,6 +1,6 @@
 /* Test OpenACC 'kernels' construct decomposition.  */
 
-/* { dg-additional-options "--param=openacc-kernels=decompose" } */
+/* { dg-additional-options "-fchecking --param=openacc-kernels=decompose" } */
 /* { dg-ice "TODO" }
    { dg-prune-output "during GIMPLE pass: omplower" } */
 
--- gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C
+++ gcc/testsuite/g++.dg/cpp0x/constexpr-52830.C
@@ -1,5 +1,6 @@
 // PR c++/52830
 // { dg-do compile { target c++11 } }
+// { dg-additional-options "-fchecking" }
 // { dg-ice "comptypes" }
 
 template<bool b> struct eif { typedef void type; };
--- gcc/testsuite/g++.dg/cpp0x/vt-88982.C
+++ gcc/testsuite/g++.dg/cpp0x/vt-88982.C
@@ -1,5 +1,6 @@
 // PR c++/88982
 // { dg-do compile { target c++11 } }
+// { dg-additional-options "-fchecking" }
 // { dg-ice "tsubst_pack_expansion" }
 
 template<typename...Ts> struct A {
--- gcc/testsuite/g++.dg/cpp1y/auto-fn61.C
+++ gcc/testsuite/g++.dg/cpp1y/auto-fn61.C
@@ -1,5 +1,6 @@
 // PR c++/88003
 // { dg-do compile { target c++14 } }
+// { dg-additional-options "-fchecking" }
 // { dg-ice "poplevel_class" }
 
 auto test() {
--- gcc/testsuite/g++.dg/cpp1z/constexpr-lambda26.C
+++ gcc/testsuite/g++.dg/cpp1z/constexpr-lambda26.C
@@ -1,5 +1,6 @@
 // PR c++/87765
 // { dg-do compile { target c++17 } }
+// { dg-additional-options "-fchecking" }
 // { dg-ice "cxx_eval_constant_expression" }
 
 template <int N>
--- gcc/testsuite/g++.dg/cpp2a/nontype-class39.C
+++ gcc/testsuite/g++.dg/cpp2a/nontype-class39.C
@@ -1,5 +1,6 @@
 // PR c++/89565
 // { dg-do compile { target c++20 } }
+// { dg-additional-options "-fchecking" }
 // { dg-ice "resolve_args" }
 
 template <auto>