test: Add case for __builtin_assume_aligned declaration in MSVC header

In commit f9a05da6 (RunClang: Tolerate __builtin_assume_aligned
declaration in MSVC header, 2020-03-31, v0.3.2~1^2) we left out a test
case.  Add one now.

1 files changed, 8 insertions, 0 deletions

diff --git a/test/input/assume_aligned.cxx b/test/input/assume_aligned.cxx
new file mode 100644
index 0000000..a6e9dc2
--- /dev/null
+++ b/test/input/assume_aligned.cxx
@@ -0,0 +1,8 @@
+constexpr void* __cdecl __builtin_assume_aligned(const void*, size_t,
+                                                 ...) noexcept;
+
+int* check_assume_aligned(int* p)
+{
+  __builtin_assume_aligned(p, 4);
+  return p;
+}