New testcase for PR424

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18281 91177308-0d34-0410-b5e6-96231b3b80d8

test/CFrontend/2004-11-27-InvalidConstantExpr.c

@@ -0,0 +1,10 @@
+// RUN: %llvmgcc %s -S -o - | not grep 'foo\* sub'
+// This should not produce a subtrace constantexpr of a pointer
+struct foo {
+  int Y;
+  char X[100];
+} F;
+
+int test(char *Y) {
+   return Y - F.X;
+}