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f27dbf50d5db12279ab018f11c93ad1704043006 by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 358298501

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864c141a59e20e96234c06700d7519d43bc73d71 by Derek Mauro <dmauro@google.com>:

Annotates the duration-to-int64 and duration-to-double conversion
functions as "pure" to potentially optimize out repeated calls with
the same argument

This adds an ABSL_ATTRIBUTE_PURE_FUNCTION macro for this purpose.

PiperOrigin-RevId: 358247225
GitOrigin-RevId: f27dbf50d5db12279ab018f11c93ad1704043006
Change-Id: I5c2238911711b15d9d3ae53da44db788f20b402b