XCTMeasureOptions.default has the wrong iterationCount

Number:rdar://FB9084432 Date Originated:2021-05-20
Status:Open Resolved:Not yet
Product:Xcode Product Version:Version 12.4 (12D4e)
Classification:Incorrect/Unexpected Behavior Reproducible:Yes
`XCTMeasureOptions.default` doesn’t actually model the default measurement options.
  * Calling `self.measure { … }` runs the block 10 times.
  * Calling `self.measure(options: XCTMeasureOptions.default) { … }` runs the block 6 times, keeping measurement for the last 5 runs.


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