Split BPF loader to match the rest of the programs (#4636)

programs/bpf_loader/src/alloc.rs

@@ -1,17 +0,0 @@
-use std::alloc::Layout;
-use std::fmt;
-
-/// Based loosely on the unstable std::alloc::Alloc trait
-pub trait Alloc {
-    fn alloc(&mut self, layout: Layout) -> Result<*mut u8, AllocErr>;
-    fn dealloc(&mut self, ptr: *mut u8, layout: Layout);
-}
-
-#[derive(Clone, PartialEq, Eq, Debug)]
-pub struct AllocErr;
-
-impl fmt::Display for AllocErr {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.write_str("Error: Memory allocation failed")
-    }
-}