Review Board 2.0.15

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Information
Submitter:	Nathan Binkert
Repository:	gem5
Branch:
Bugs:
Depends On:
Reviewers
Groups:	Default
People:	ali, gblack, nate, stever

Description

time: improve time datastructure

Use posix clock functions (and librt) if it is available.
Inline a bunch of functions and implement more operators.

Testing Done

quick regressions pass