[libunwind] Adjust libunwind_01.pass.cpp test for ARM EHABI

[john.brawn]

Summary

ARM EHABI unwinding tables only store the start address of each function, so the last function is assumed to cover the entire address space after it. The test picks an address on the stack assuming that it's in no function, but because of the above it's actually resolved to the last function. Fix this by using address 0 instead.

[compnerd]

*sigh* I thought it used the size of the function to mark the end of the region. Thanks.

libunwind/test/libunwind_01.pass.cpp

void test_no_info() {
   unw_init_local(&cursor, &context);
 
   unw_proc_info_t info;
   int ret = unw_get_proc_info(&cursor, &info);
   if (ret != UNW_ESUCCESS)
     abort();
 
   // Set the IP to an address clearly outside any function.
-  unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)&context);
+  unw_set_reg(&cursor, UNW_REG_IP, (unw_word_t)0);
 
   ret = unw_get_proc_info(&cursor, &info);
   if (ret != UNW_ENOINFO)
     abort();
 }
 
 int main() {
   test1(1);
   test2(1, 2);
   test3(1, 2, 3);
   test_no_info();
 }