Make a few tests optimization-proof. These tests were failing under -O3 because the optimizer was eliminating the call to new.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@172631 91177308-0d34-0410-b5e6-96231b3b80d8

test/language.support/support.dynamic/new.delete/new.delete.array/new_array.pass.cpp

@@ -35,7 +35,7 @@ int main()
     std::set_new_handler(new_handler);
     try
     {
-        void* vp = operator new[] (std::numeric_limits<std::size_t>::max());
+        void*volatile vp = operator new[] (std::numeric_limits<std::size_t>::max());
         assert(false);
     }
     catch (std::bad_alloc&)

test/language.support/support.dynamic/new.delete/new.delete.array/new_array_nothrow.pass.cpp

@@ -35,7 +35,7 @@ int main()
     std::set_new_handler(new_handler);
     try
     {
-        void* vp = operator new [] (std::numeric_limits<std::size_t>::max(), std::nothrow);
+        void*volatile vp = operator new [] (std::numeric_limits<std::size_t>::max(), std::nothrow);
         assert(new_handler_called == 1);
         assert(vp == 0);
     }

test/language.support/support.dynamic/new.delete/new.delete.array/new_array_nothrow_replace.pass.cpp

@@ -29,7 +29,7 @@ void  operator delete(void* p) throw()
     std::free(p);
 }
 
-int A_constructed = 0;
+volatile int A_constructed = 0;
 
 struct A
 {

test/language.support/support.dynamic/new.delete/new.delete.array/new_array_replace.pass.cpp

@@ -15,7 +15,7 @@
 #include <cassert>
 #include <limits>
 
-int new_called = 0;
+volatile int new_called = 0;
 
 void* operator new(std::size_t s) throw(std::bad_alloc)
 {