PNaCl: Fix handling of va_arg on structs in simplification passes

test/Transforms/NaCl/pnacl-abi-simplify-preopt.ll

Index: test/Transforms/NaCl/pnacl-abi-simplify-preopt.ll
diff --git a/test/Transforms/NaCl/pnacl-abi-simplify-preopt.ll b/test/Transforms/NaCl/pnacl-abi-simplify-preopt.ll
index 1cf73775594ba43ce4a2d7937436d63b8be09e66..e34c46d80c8abe3ba5abd27bd4f4d4d8a8791a9c 100644
--- a/test/Transforms/NaCl/pnacl-abi-simplify-preopt.ll
+++ b/test/Transforms/NaCl/pnacl-abi-simplify-preopt.ll
@@ -25,6 +25,18 @@ define void @varargs_func(...) {
 ; CHECK-NOT: @varargs_func(...)
 
 
+%MyStruct = type { i32, i32 }
+
+; Checks that ExpandVarArgs and ExpandStructRegs are applied in the
+; right order.
+define void @get_struct_from_varargs(i8* %va_list, %MyStruct* %dest) {
+  %val = va_arg i8* %va_list, %MyStruct
+  store %MyStruct %val, %MyStruct* %dest
+  ret void
+}
+; CHECK-NOT: va_arg
+
+
 @llvm.global_ctors = appending global [0 x { i32, void ()* }] zeroinitializer
 ; CHECK-NOT: @llvm.global_ctors