Sync https://github.com/ruby/ruby/pull/14866 #20
Merged
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Fixes #19
Low resolution-clock is added in windows, but it shouldn't be used in assert_linear_performance.
ruby/ruby's core_assertion.rb selects clock that has enough resolution.
https://github.com/ruby/ruby/pull/14866/files#diff-cd83e37e349e8cf458780bae62026a2c0d5a908a6ce40638d1f862b1a8800cf5