Lower signatures exposing struct registers to byval struct pointers

test/Transforms/NaCl/simplify-struct-reg-pad-crash.ll

+; RUN: not opt < %s -simplify-struct-reg-signatures -S
+; REQUIRES: asserts

[JF, 2015/03/20 16:41:32]

Do you actually need this? It'll still crash even in a no-assert build because
report_fatal_error doesn't get removed.

[Mircea Trofin, 2015/03/20 18:31:32]

Done.

+
+%struct = type { i32, i32 }
+
+declare i32 @__hypothetical_personality_1(%struct)
+declare %struct @__hypothetical_personality_2(i32)

[Mircea Trofin, 2015/03/20 00:07:24]

I'll remove this second personality, actually. I could create another test file
with it, but it might be overkill.

+
+declare void @something_to_invoke()
+
+; landingpad with struct
+define void @landingpad_is_struct() {
+  invoke void @something_to_invoke()
+    to label %OK unwind label %Err
+
+OK:
+  ret void
+
+Err:
+  %exn = landingpad i32 personality i32(%struct)* @__hypothetical_personality_1
+      cleanup
+  resume i32 %exn
+}