Adjust fuel consumption of maps (#12875)

Consume fuel based on the host's representation of memory rather than
the guest's. This matches what arrays do, for example.

Author: alexcrichton

crates/wasmtime/src/runtime/component/func/typed.rs

@@ -2315,7 +2315,7 @@ where
         .checked_mul(usize::try_from(map.entry_abi.size32)?)
         .and_then(|total| ptr.checked_add(total))
     {
-        Some(n) if n <= cx.memory().len() => cx.consume_fuel(n - ptr)?,
+        Some(n) if n <= cx.memory().len() => cx.consume_fuel_array(len, size_of::<(K, V)>())?,
         _ => bail!("map pointer/length out of bounds of memory"),
     }
     if ptr % (map.entry_abi.align32 as usize) != 0 {

crates/wasmtime/src/runtime/component/values.rs

@@ -1001,7 +1001,7 @@ fn load_map(cx: &mut LiftContext<'_>, ty: TypeMapIndex, ptr: usize, len: usize)
         .checked_mul(tuple_size)
         .and_then(|len| ptr.checked_add(len))
     {
-        Some(n) if n <= cx.memory().len() => cx.consume_fuel(n - ptr)?,
+        Some(n) if n <= cx.memory().len() => cx.consume_fuel_array(len, size_of::<(Val, Val)>())?,
         _ => bail!("map pointer/length out of bounds of memory"),
     }
     if ptr % usize::try_from(tuple_alignment)? != 0 {