[VM] Move mapping "RawInstruction -> offset" mapping into ImageWriter This makes the ImageWriter remember at which offsets it wrote RawInstructions. This is preparation work for allowing the ImageWriter write the instructions in a specific order (currently instructions are written "on-demand" when the object serializer encounters references to them) Issue https://github.com/dart-lang/sdk/issues/33274 Change-Id: Ie50cf8a600dd4e9ce0413fe4189d4f2211f0325e Reviewed-on: https://dart-review.googlesource.com/c/82065 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com> Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
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