[vm/compiler] Add the framework for the IL deserializer.

This adds in a version of the IL deserializer that doesn't actually do
any deserialization yet.

However, it adds in a couple of compile passes that passes the FlowGraph
for compiled functions through the serializer and deserializer.  If the
deserialization step succeeds, then the FlowGraph stored in the
CompilerPassState is replaced with the new FlowGraph for the rest of the
compiler.

Also change the default zone handling in the FlowGraphSerializer to use
the zone for the current thread, instead of the zone stored in the
FlowGraph, so that it is appropriately affected by StackZone uses.

Bug: https://github.com/dart-lang/sdk/issues/36882
Change-Id: I8fa1c7af434f724ccec45ddb73263f84730af5b0
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/113184
Commit-Queue: Teagan Strickland <sstrickl@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Aart Bik <ajcbik@google.com>