[Bug sanitizer/108834] LTO: ltrans temporary file is used as module name in ASAN

["marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108834

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
So the module name is a string that is displayed when an ASAN error happens and
I see a discrepancy in between GCC and Clang (with LTO):

$ cat jhead.i
int x;
int *p;
int main() {
  p = &x;
  *(p + 1) = 123;

  return 0;
}

$ clang jhead.i -fsanitize=address -flto && ./a.out
...
0x555555fc34e4 is located 28 bytes to the left of the global variable 'p'
defined in 'jhead.i' (0x555555fc3500) of size 8

$ gcc jhead.i -fsanitize=address -flto && ./a.out
...
0x000000404104 is located 60 bytes before global variable 'p' defined in
'/tmp/cci9oq4s.ltrans0.o' (0x404140) of size 8

$ gcc jhead.i -fsanitize=address && ./a.out
...
0x000000404104 is located 0 bytes after global variable 'x' defined in
'jhead.i' (0x404100) of size 4

So, yes, we should follow the DECL_CONTEXT.