[vm/compiler] Fix truncating logic Rationale: The representation mask should not be used to do the truncation, which is more subtle around the sign bit. With regression test. https://github.com/dart-lang/sdk/issues/38147 Change-Id: I9745f6d73f4761eb6210e0b60b2b0504994f5cbf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/115607 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Aart Bik <ajcbik@google.com>
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