Move to miri.rs and re-export it

Author: Aaron1011

src/libpanic_unwind/lib.rs

@@ -39,6 +39,9 @@ cfg_if::cfg_if! {
     if #[cfg(miri)] {
         #[path = "miri.rs"]
         mod imp;
+        // Export this at the root of the crate so that Miri
+        // has a stable palce to look it up
+        pub use imp::miri_panic_trampoline;
     } else if #[cfg(target_os = "emscripten")] {
         #[path = "emcc.rs"]
         mod imp;
@@ -98,7 +101,4 @@ pub unsafe extern "C" fn __rust_start_panic(payload: usize) -> u32 {
     imp::panic(Box::from_raw((*payload).box_me_up()))
 }
 
-// A dummy helper function for Miri.
-// Used to push an empty stack frame when we start unwinding
-#[cfg(miri)]
-pub fn miri_panic_trampoline() {}
+

src/libpanic_unwind/miri.rs

@@ -21,3 +21,8 @@ pub unsafe fn cleanup(ptr: *mut u8) -> Box<dyn Any + Send> {
 fn rust_eh_personality() {
     unsafe { core::intrinsics::abort() }
 }
+
+// A dummy helper function for Miri.
+// Used to push an empty stack frame when we start unwinding
+#[cfg(miri)]
+pub fn miri_panic_trampoline() {}