There were two identical files named 'min_allocator.h'. Move one of them to /support and delete the other. Then adjust all the tests that used them to include the moved one. No functionality change.

llvm-svn: 195785
diff --git a/libcxx/test/strings/basic.string/string.cons/substr.pass.cpp b/libcxx/test/strings/basic.string/string.cons/substr.pass.cpp
index 1607211..3e04a97 100644
--- a/libcxx/test/strings/basic.string/string.cons/substr.pass.cpp
+++ b/libcxx/test/strings/basic.string/string.cons/substr.pass.cpp
@@ -19,7 +19,7 @@
 #include <cassert>
 
 #include "../test_allocator.h"
-#include "../min_allocator.h"
+#include "min_allocator.h"
 
 template <class S>
 void