New testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8275 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/TailDup/2003-08-31-UnreachableBlocks.ll

@@ -0,0 +1,20 @@
+; RUN: llvm-as < %s | opt -tailduplicate -disable-output
+
+int %foo() {
+entry:
+	br label %return.i
+
+after_ret.i:
+	br label %return.i
+
+return.i:
+	%tmp.3 = cast int* null to int
+	br label %return.i1
+
+after_ret.i1:
+	br label %return.i1
+
+return.i1:
+	%tmp.8 = sub int %tmp.3, 0
+	ret int 0
+}