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Refactor System information collection -- Add CPU Cache Info (#483)

* Refactor System information collection.

This patch refactors the system information collection,
and in particular information about the target CPU. The
motivation is to make it easier to access CPU information,
and easier to add new information as need be.

This patch additionally adds information about the cache
sizes of the CPU.

* Address review comments: Clean up integer types.

This commit cleans up the integer types used in ValueUnion to
follow the Google style guide.

Additionally it adds a BENCHMARK_UNREACHABLE macro to assist
in documenting/catching unreachable code paths.

* Rename ValueUnion accessors.

148 of 148 new or added lines in 5 files covered. (100.0%)

1441 of 1659 relevant lines covered (86.86%)

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