move InitMask to its own module

Author: RalfJung

compiler/rustc_codegen_llvm/src/consts.rs

@@ -38,9 +38,7 @@ pub fn const_alloc_to_llvm<'ll>(cx: &CodegenCx<'ll, '_>, alloc: ConstAllocation<
         alloc: &'a Allocation,
         range: Range<usize>,
     ) {
-        let chunks = alloc
-            .init_mask()
-            .range_as_init_chunks(Size::from_bytes(range.start), Size::from_bytes(range.end));
+        let chunks = alloc.init_mask().range_as_init_chunks(range.clone().into());
 
         let chunk_to_llval = move |chunk| match chunk {
             InitChunk::Init(range) => {

compiler/rustc_const_eval/src/interpret/memory.rs

@@ -1089,7 +1089,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             .prepare_copy(src_range, dest_offset, num_copies, self)
             .map_err(|e| e.to_interp_error(dest_alloc_id))?;
         // Prepare a copy of the initialization mask.
-        let init = src_alloc.compress_uninit_range(src_range);
+        let init = src_alloc.init_mask().prepare_copy(src_range);
 
         // Destination alloc preparations and access hooks.
         let (dest_alloc, extra) = self.get_alloc_raw_mut(dest_alloc_id)?;
@@ -1155,8 +1155,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         }
 
         // now fill in all the "init" data
-        dest_alloc.mark_compressed_init_range(
-            &init,
+        dest_alloc.init_mask_apply_copy(
+            init,
             alloc_range(dest_offset, size), // just a single copy (i.e., not full `dest_range`)
             num_copies,
         );