Add casts to avoid a bunch of unused expr warnings. (They aren't reported right now due to a bug that I intend to fix). Ted, please review.

llvm-svn: 77630

clang/test/Analysis/array-struct.c

@@ -143,7 +143,7 @@ void f15() {
   int a[10];
   bar(a);
   if (a[1]) // no-warning
-    1;
+    (void)1;
 }
 
 struct s3 p[1];

clang/test/Analysis/casts.c

@@ -28,7 +28,7 @@ void f1(struct s **pval) {
   tbool = (int *)pval; // Should record the cast-to type here.
   char c = (unsigned char) *tbool; // Should use cast-to type to create symbol.
   if (*tbool == -1)
-    3;
+    (void)3;
 }
 
 void f2(const char *str) {

clang/test/Analysis/region-only-test.c

@@ -9,5 +9,5 @@ void foo(int* p) {
   if (p[0] == 1)
     x = &a;
   if (p[0] == 1)
-    *x; // no-warning
+    (void)*x; // no-warning
 }