Add testcase for when there is no loop header

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2611 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/LICM/no-preheader-test.ll

@@ -0,0 +1,21 @@
+; Test that LICM works when there is not a loop-preheader
+; RUN: as < %s | opt -licm | dis
+
+void "testfunc"(int %i, bool %ifcond) {
+	br bool %ifcond, label %Then, label %Else
+Then:
+	br label %Loop
+Else:
+	br label %Loop
+
+Loop:
+	%j = phi uint [0, %Then], [12, %Else], [%Next, %Loop]
+	%i = cast int %i to uint
+	%i2 = mul uint %i, 17
+	%Next = add uint %j, %i2
+	%cond = seteq uint %Next, 0
+	br bool %cond, label %Out, label %Loop
+
+Out:
+	ret void
+}