New testcase, distilled from povray I think.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12364 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/InstCombine/2004-03-13-InstCombineInfLoop.ll

@@ -0,0 +1,13 @@
+; This testcase caused the combiner to go into an infinite loop, moving the 
+; cast back and forth, changing the seteq to operate on int vs uint and back.
+
+; RUN: llvm-as < %s | opt -instcombine -disable-output
+
+bool %test(uint %A, int %B) {
+        %C = sub uint 0, %A
+        %Cc = cast uint %C to int
+        %D = sub int 0, %B
+        %E = seteq int %Cc, %D
+        ret bool %E
+}
+