std: Standardize (input, output) param orderings

This functions swaps the order of arguments to a few functions that previously
took (output, input) parameters, but now take (input, output) parameters (in
that order).

The affected functions are:

* ptr::copy
* ptr::copy_nonoverlapping
* slice::bytes::copy_memory
* intrinsics::copy
* intrinsics::copy_nonoverlapping

Closes #22890
[breaking-change]

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libstd/collections/hash/table.rs b/src/libstd/collections/hash/table.rs
index 8f659334538..aa3195cbf01 100644
--- a/src/libstd/collections/hash/table.rs
+++ b/src/libstd/collections/hash/table.rs
@@ -480,8 +480,8 @@ impl<K, V, M: Deref<Target=RawTable<K, V>>> GapThenFull<K, V, M> {
     pub fn shift(mut self) -> Option<GapThenFull<K, V, M>> {
         unsafe {
             *self.gap.raw.hash = mem::replace(&mut *self.full.raw.hash, EMPTY_BUCKET);
-            ptr::copy_nonoverlapping(self.gap.raw.key, self.full.raw.key, 1);
-            ptr::copy_nonoverlapping(self.gap.raw.val, self.full.raw.val, 1);
+            ptr::copy_nonoverlapping(self.full.raw.key, self.gap.raw.key, 1);
+            ptr::copy_nonoverlapping(self.full.raw.val, self.gap.raw.val, 1);
         }
 
         let FullBucket { raw: prev_raw, idx: prev_idx, .. } = self.full;