[vm] Simplify VirtualMemory::Truncate Callers always want to try to unmap the trailing pages, and the OS-specific FreeSubSegment helper routine can never fail. Simplify code accordingly. Change-Id: I32e4bc72f626e15032d73326bee76a4a2ef71025 Reviewed-on: https://dart-review.googlesource.com/c/91146 Auto-Submit: Matthew Dempsky <mdempsky@google.com> Reviewed-by: Zach Anderson <zra@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
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