Revert "Bypass alignment related copy whenever possible (#1443)"

This reverts commit 235d4f8957ee4566d6217783638fa58a586bb35a.

old-commit-hash: d5ca841b0f18d2e707eb1f73afac842ede9be7e8

selfdrive/common/messagehelp.h

@@ -1,42 +0,0 @@
-#pragma once
-#include <capnp/serialize.h>
-
-#include "cereal/gen/cpp/log.capnp.h"
-#include "messaging.hpp"
-class MessageReader {
- public:
-  MessageReader(Message *msg) : msg(msg), buf(nullptr), msg_reader(nullptr) {}
-  ~MessageReader() {
-    if (msg_reader) delete msg_reader;
-    if (buf) free(buf);
-    if (msg) delete msg;
-  }
-  inline operator bool() { return msg != NULL; }
-  inline const char* getData() { return msg->getData(); }
-  inline size_t getSize() { return msg->getSize(); }
-  cereal::Event::Reader &getEvent() {
-    if (!msg_reader) {
-      msg_reader = newReader();
-      event = msg_reader->getRoot<cereal::Event>();
-    }
-    return event;
-  }
-
- private:
-  capnp::FlatArrayMessageReader *newReader() {
-    const char *data = msg->getData();
-    const size_t size = msg->getSize();
-    if (((reinterpret_cast<uintptr_t>(data)) % sizeof(capnp::word) == 0) && size % sizeof(capnp::word) == 0) {
-      return new capnp::FlatArrayMessageReader(kj::ArrayPtr<capnp::word>((capnp::word *)data, size / sizeof(capnp::word)));
-    } else {
-      const size_t words = size / sizeof(capnp::word) + 1;
-      buf = (capnp::word *)malloc(words * sizeof(capnp::word));
-      memcpy(buf, data, size);
-      return new capnp::FlatArrayMessageReader(kj::ArrayPtr<capnp::word>(buf, words));
-    }
-  }
-  capnp::word *buf;
-  Message *msg;
-  capnp::FlatArrayMessageReader *msg_reader;
-  cereal::Event::Reader event;
-};