pw_stream: constexpr memory stream constructors No-Docs-Update-Reason: No feature changes. Change-Id: Ide76108510c7e23538a8b1f747d6cf29d0e1e1ba Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/43742 Pigweed-Auto-Submit: Armando Montanez <amontanez@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com> Reviewed-by: Ewout van Bekkum <ewout@google.com>
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