Fix test failures caused by new/delete calls getting optimized away

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@296813 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array_calls_unsized_delete_array.pass.cpp

@@ -46,9 +46,11 @@ void operator delete[](void* p, const std::nothrow_t&) TEST_NOEXCEPT
 //   selected.
 struct A { ~A() {} };
 
+A *volatile x;
+
 int main()
 {
-    A* x = new A[3];
+    x = new A[3];
     assert(0 == delete_called);
     assert(0 == delete_nothrow_called);
 

test/std/language.support/support.dynamic/new.delete/new.delete.single/new_replace.pass.cpp

@@ -43,9 +43,11 @@ struct A
     ~A() {A_constructed = false;}
 };
 
+A *volatile ap;
+
 int main()
 {
-    A* ap = new A;
+    ap = new A;
     assert(ap);
     assert(A_constructed);
     assert(new_called);

test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete11.pass.cpp

@@ -44,9 +44,11 @@ void operator delete(void* p, std::size_t) TEST_NOEXCEPT
     std::free(p);
 }
 
+int *volatile x;
+
 int main()
 {
-    int *x = new int(42);
+    x = new int(42);
     assert(0 == unsized_delete_called);
     assert(0 == unsized_delete_nothrow_called);
     assert(0 == sized_delete_called);

test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp

@@ -49,9 +49,11 @@ void operator delete(void* p, std::size_t) TEST_NOEXCEPT
     std::free(p);
 }
 
+int *volatile x;
+
 int main()
 {
-    int *x = new int(42);
+    x = new int(42);
     assert(0 == unsized_delete_called);
     assert(0 == unsized_delete_nothrow_called);
     assert(0 == sized_delete_called);

test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete_fsizeddeallocation.sh.cpp

@@ -17,7 +17,7 @@
 // NOTE: Only clang-3.7 and GCC 5.1 and greater support -fsized-deallocation.
 // REQUIRES: fsized-deallocation
 
-// RUN: %build -fsized-deallocation
+// RUN: %build -fsized-deallocation -O3
 // RUN: %run
 
 #if !defined(__cpp_sized_deallocation)