new testcase that crashes global opt, reduced from chomp

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31351 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/GlobalOpt/2006-11-01-ShrinkGlobalPhiCrash.ll

@@ -0,0 +1,33 @@
+; RUN: llvm-as < %s | opt -globalopt -disable-output
+	%struct._list = type { int*, %struct._list* }
+	%struct._play = type { int, int*, %struct._list*, %struct._play* }
+%nrow = internal global int 0		; <int*> [#uses=2]
+
+implementation   ; Functions:
+
+void %make_play() {
+entry:
+	br label %cond_true16.i
+
+cond_true16.i:		; preds = %cond_true16.i, %entry
+	%low.0.in.i.0 = phi int* [ %nrow, %entry ], [ null, %cond_true16.i ]		; <int*> [#uses=1]
+	%low.0.i = load int* %low.0.in.i.0		; <int> [#uses=0]
+	br label %cond_true16.i
+}
+
+void %make_wanted() {
+entry:
+	unreachable
+}
+
+void %get_good_move() {
+entry:
+	ret void
+}
+
+void %main() {
+entry:
+	store int 8, int* %nrow
+	tail call void %make_play( )
+	ret void
+}