Add XFAIL test for assertion error

Author: Dylan McKay

test/CodeGen/AVR/expand-integer-failure.ll

@@ -0,0 +1,23 @@
+; RUN: llc < %s -march=avr | FileCheck %s
+; XFAIL: *
+
+; Causes an assertion error
+; Assertion failed: (Lo.getValueType() == TLI.getTypeToTransformTo(*DAG.getContext(), Op.getValueType()) &&
+;   Hi.getValueType() == Lo.getValueType() &&
+;   "Invalid type for expanded integer"),
+; function SetExpandedInteger
+; file lib/CodeGen/SelectionDAG/LegalizeTypes.cpp
+
+; CHECK-LABEL: foo
+define void @foo(i16 %a) {
+ifcont:
+  %cmp_result = icmp eq i16 %a, 255
+  %bool_result = uitofp i1 %cmp_result to double
+  %result = fcmp one double 0.000000e+00, %bool_result
+  br i1 %result, label %then, label %else
+then:
+  ret void
+else:
+  ret void
+}
+