Issue #3516912: add fallback for MemoryBackend

This adds a fallback for the MemoryBackend::__construct() to allow instantiation without a time value in the signature.

Closes #3516912

added 1 commit

• 0a9de7ed - Issue #3516912: Pantheon MemoryBackend failure.

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added 1 commit

• 6a3923ac - Issue #3516912: format code to meet Drupal standards

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