Found six (nmostly) identical files named 'test_allocator.h' in the libcxx test suite. Moved one to /support, made it a superset, and removed all but one of the others, and iupdated all the includes. Left the odd one (thread/futures/test_allocator.h) for later.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@196174 91177308-0d34-0410-b5e6-96231b3b80d8

test/containers/container.adaptors/stack/stack.cons.alloc/ctor_alloc.pass.cpp

@@ -15,7 +15,7 @@
 #include <stack>
 #include <cassert>
 
-#include "../../../test_allocator.h"
+#include "test_allocator.h"
 
 struct test
     : private std::stack<int, std::deque<int, test_allocator<int> > >

test/containers/container.adaptors/stack/stack.cons.alloc/ctor_container_alloc.pass.cpp

@@ -15,7 +15,7 @@
 #include <stack>
 #include <cassert>
 
-#include "../../../test_allocator.h"
+#include "test_allocator.h"
 
 template <class C>
 C

test/containers/container.adaptors/stack/stack.cons.alloc/ctor_copy_alloc.pass.cpp

@@ -15,7 +15,7 @@
 #include <stack>
 #include <cassert>
 
-#include "../../../test_allocator.h"
+#include "test_allocator.h"
 
 template <class C>
 C

test/containers/container.adaptors/stack/stack.cons.alloc/ctor_rcontainer_alloc.pass.cpp

@@ -15,7 +15,7 @@
 #include <stack>
 #include <cassert>
 
-#include "../../../test_allocator.h"
+#include "test_allocator.h"
 #include "../../../MoveOnly.h"
 
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES

test/containers/container.adaptors/stack/stack.cons.alloc/ctor_rqueue_alloc.pass.cpp

@@ -15,7 +15,7 @@
 #include <stack>
 #include <cassert>
 
-#include "../../../test_allocator.h"
+#include "test_allocator.h"
 #include "../../../MoveOnly.h"
 
 #ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES