Improve test case.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59902 91177308-0d34-0410-b5e6-96231b3b80d8

test/Analysis/array-struct.c

@@ -62,7 +62,7 @@ void f7() {
 
 void f8() {
   int a[10];
-  a[sizeof(a) - 1] = 1;
+  a[sizeof(a)/sizeof(int) - 1] = 1;
 }
 
 void f9() {