Add CodeGen support for alignment on globals, both for unusual natural 
alignment and alignment attributes.

llvm-svn: 51676
diff --git a/clang/test/CodeGen/var-align.c b/clang/test/CodeGen/var-align.c
new file mode 100644
index 0000000..be585c0
--- /dev/null
+++ b/clang/test/CodeGen/var-align.c
@@ -0,0 +1,4 @@
+// RUN: clang -emit-llvm %s -o - | grep "align 16" | count 2
+
+__attribute((aligned(16))) float a[128];
+union {int a[4]; __attribute((aligned(16))) float b[4];} u;