Reland part of "Add AIX Target Info"

This patch reland the test case max_align.c which is failing at
Windows and PS4 platform in the previous commit.

Differential Revision: https://reviews.llvm.org/D59048

original llvm-svn: 356060

llvm-svn: 356197

clang/test/Headers/max_align.c

@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -fsyntax-only -std=c11 -verify %s
+// expected-no-diagnostics
+
+// XFAIL: windows-
+
+#ifndef __BIGGEST_ALIGNMENT__
+#error __BIGGEST_ALIGNMENT__ not defined
+#endif
+
+#include <stddef.h>
+
+_Static_assert(__BIGGEST_ALIGNMENT__ == _Alignof(max_align_t), "");