Revert "Make memory maps repr(C)"

uefi/CHANGELOG.md

@@ -5,7 +5,6 @@
   the extended processor topology.
 
 ## Changed
-- Made memory map types `#[repr(C)]`
 - Added `char16!` const-compatible macro as convenient replacement for `Char16::try_from().unwrap()`
 - `proto::debug::SystemContextARM` now contains the trailing `IFAR` field
   mandated by the spec.

uefi/src/mem/memory_map/impl_.rs

@@ -44,7 +44,6 @@ impl core::error::Error for MemoryMapError {}
 
 /// Implementation of [`MemoryMap`] for the given buffer.
 #[derive(Debug)]
-#[repr(C)]
 pub struct MemoryMapRef<'a> {
     buf: &'a [u8],
     meta: MemoryMapMeta,
@@ -108,7 +107,6 @@ impl Index<usize> for MemoryMapRef<'_> {
 
 /// Implementation of [`MemoryMapMut`] for the given buffer.
 #[derive(Debug)]
-#[repr(C)]
 pub struct MemoryMapRefMut<'a> {
     buf: &'a mut [u8],
     meta: MemoryMapMeta,
@@ -289,7 +287,6 @@ impl IndexMut<usize> for MemoryMapRefMut<'_> {
 ///
 /// [`boot::get_memory_map`]: crate::boot::get_memory_map
 #[derive(Debug)]
-#[repr(C)]
 pub(crate) struct MemoryMapBackingMemory(NonNull<[u8]>);
 
 impl MemoryMapBackingMemory {
@@ -389,7 +386,6 @@ impl Drop for MemoryMapBackingMemory {
 
 /// Implementation of [`MemoryMapMut`] that owns the buffer on the UEFI heap.
 #[derive(Debug)]
-#[repr(C)]
 pub struct MemoryMapOwned {
     /// Backing memory, properly initialized at this point.
     pub(crate) buf: MemoryMapBackingMemory,

uefi/src/mem/memory_map/mod.rs

@@ -64,7 +64,6 @@ pub struct MemoryMapKey(pub(crate) usize);
 /// called. All following invocations (hidden, subtle, and asynchronous ones)
 /// will likely invalidate this.
 #[derive(Copy, Clone, Debug)]
-#[repr(C)]
 pub struct MemoryMapMeta {
     /// The actual size of the map.
     pub map_size: usize,