use CLOCK_BOOTTIME in Instant::now#88714
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hellow554 wants to merge 2 commits intorust-lang:masterfrom
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There was a discussion on #87907 that all platforms expect
linux advance its monotonic timer if the system goes into a sleep state
(e.g. suspend or hibernate).
It was decided that CLOCK_BOOTTIME should be used on inux targets, but
because that constant would break older systems (e.g. linux kernels
<2.6.39) there should be a fallback to CLOCK_MONOTONIC.
Related to #87907
Closes #87906
cc @joshtriplett @cuviper