Revert "Create bank snapshots (#3671)" (#4243)

This reverts commit abf2b300da.

runtime/src/serde_utils.rs

@@ -1,62 +0,0 @@
-use std::fmt;
-use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
-
-struct U64Visitor;
-impl<'a> serde::de::Visitor<'a> for U64Visitor {
-    type Value = u64;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        formatter.write_str("Expecting u64")
-    }
-    fn visit_u64<E>(self, data: u64) -> std::result::Result<u64, E>
-    where
-        E: serde::de::Error,
-    {
-        Ok(data)
-    }
-}
-
-pub fn deserialize_atomicusize<'de, D>(d: D) -> Result<AtomicUsize, D::Error>
-where
-    D: serde::de::Deserializer<'de>,
-{
-    let value = d.deserialize_u64(U64Visitor)?;
-    Ok(AtomicUsize::new(value as usize))
-}
-
-pub fn serialize_atomicusize<S>(x: &AtomicUsize, s: S) -> Result<S::Ok, S::Error>
-where
-    S: serde::Serializer,
-{
-    s.serialize_u64(x.load(Ordering::SeqCst) as u64)
-}
-
-struct BoolVisitor;
-impl<'a> serde::de::Visitor<'a> for BoolVisitor {
-    type Value = bool;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        formatter.write_str("Expecting bool")
-    }
-    fn visit_bool<E>(self, data: bool) -> std::result::Result<bool, E>
-    where
-        E: serde::de::Error,
-    {
-        Ok(data)
-    }
-}
-
-pub fn deserialize_atomicbool<'de, D>(d: D) -> Result<AtomicBool, D::Error>
-where
-    D: serde::de::Deserializer<'de>,
-{
-    let value = d.deserialize_bool(BoolVisitor)?;
-    Ok(AtomicBool::new(value))
-}
-
-pub fn serialize_atomicbool<S>(x: &AtomicBool, s: S) -> Result<S::Ok, S::Error>
-where
-    S: serde::Serializer,
-{
-    s.serialize_bool(x.load(Ordering::SeqCst))
-}