Moved and improved test cases for Issue #1462.

Fixed an old test case for unsigned enum bit-fields that are supposed to be int-promoted.

test/val/bug1462-2.c

@@ -0,0 +1,51 @@
+
+/* issue #1462 - Bit-fields are still broken */
+/* even the = operation is buggy in certain ways */
+
+#include <stdio.h>
+
+typedef struct {
+    signed int a : 3;
+    signed int b : 3;
+    signed int c : 3;
+} T;
+
+int failures = 0;
+
+T *f(T *t)
+{
+    t->a = 0;
+    t->c = 0;
+    return t;
+}
+
+void test(void)
+{
+    T a = { 7, 0, 7 };
+    T *p = &a;
+
+    a.b = f(p)->a;
+
+    if (a.a != 0) {
+        ++failures;
+    }
+    printf("%d\n", a.a);
+
+    if (p->b != 0) {
+        ++failures;
+    }
+    printf("%d\n", p->b);
+
+    if ((&a)->c != 0) {
+        ++failures;
+    }
+    printf("%d\n", (&a)->c);
+
+    printf("Failures: %d\n", failures);
+}
+
+int main(void)
+{
+    test();
+    return failures;
+}