[Bug gold/18663] gold/testsuite/script_test_1.cc is incompatible with GCC 5

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=18663

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
gold/testsuite/script_test_11.t has the same issue:

---
static unsigned int buffer1[256] __attribute((used));
static unsigned int buffer2[256] __attribute((used)) = { 1 };

unsigned int foo __attribute__((section(".foo")));
extern char __foo_start;
extern char __foo_end;

int
main (void)
{
  if (&__foo_end - &__foo_start != sizeof(foo))
    return 1;
  if (&__foo_start != (char *)&foo)
    return 2;
  return 0;
}
---

GCC 5 folds "&__foo_start != (char *)&foo" to true.

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