Bless a Miri test

Author: saethlin

src/tools/miri/tests/fail/ptr_swap_nonoverlapping.stderr

@@ -1,8 +1,6 @@
 
-thread 'main' ($TID) panicked at tests/fail/ptr_swap_nonoverlapping.rs:LL:CC:
-unsafe precondition(s) violated: ptr::swap_nonoverlapping requires that both pointer arguments are aligned and non-null and the specified memory ranges do not overlap
-
-This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.
+thread 'main' ($TID) panicked at RUSTLIB/core/src/ptr/mod.rs:LL:CC:
+ptr::swap_nonoverlapping requires that both pointer arguments are aligned and non-null and the specified memory ranges do not overlap (x:$HEX, y:$HEX, size:8, align:8, count:1)
 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
 note: in Miri, you may have to set `MIRIFLAGS=-Zmiri-env-forward=RUST_BACKTRACE` for the environment variable to have an effect
 thread caused non-unwinding panic. aborting.
@@ -17,6 +15,7 @@ LL |         crate::process::abort();
    = note: inside closure at RUSTLIB/std/src/panicking.rs:LL:CC
    = note: inside `std::sys::backtrace::__rust_end_short_backtrace::<{closure@std::panicking::panic_handler::{closure#0}}, !>` at RUSTLIB/std/src/sys/backtrace.rs:LL:CC
    = note: inside `std::panicking::panic_handler` at RUSTLIB/std/src/panicking.rs:LL:CC
+   = note: inside `std::ptr::swap_nonoverlapping::precondition_check::runtime` at RUSTLIB/core/src/ub_checks.rs:LL:CC
 note: inside `main`
   --> tests/fail/ptr_swap_nonoverlapping.rs:LL:CC
    |