make the x86-32 backend specify a byval alignment, even when the
code generator will do it.  With this patch, clang compiles the example
in PR9794 to not have an alloca temporary.

llvm-svn: 131881
diff --git a/clang/test/CodeGen/struct-passing.c b/clang/test/CodeGen/struct-passing.c
index 3e173be..8e5c0ad 100644
--- a/clang/test/CodeGen/struct-passing.c
+++ b/clang/test/CodeGen/struct-passing.c
@@ -20,5 +20,5 @@
 // CHECK: declare i32 @f1() readonly
 // CHECK: declare void @f2({{.*}} sret)
 // CHECK: declare void @f3({{.*}} sret)
-// CHECK: declare void @f4({{.*}} byval)
-// CHECK: declare void @f5({{.*}} byval)
+// CHECK: declare void @f4({{.*}} byval align 4)
+// CHECK: declare void @f5({{.*}} byval align 4)