Open Radar

 
Summary:
During test phase I gather code coverage files to export them to the Codecov tool in order to track the quality of my code.

However with Xcode 8 the coverage reports are always to 0%. Everything works inside Xcode 8 but using xcodebuild the coverage files only indicates empty lines. For example:

```
      0|   45|  public convenience init(L: CGFloat, a: CGFloat, b: CGFloat) {
      0|   46|    let clippedL = clip(L, 0, 100)
      0|   47|    let clippedA = clip(a, -128, 127)
      0|   48|    let clippedB = clip(b, -128, 127)
```

For more information this github issue: https://github.com/codecov/example-swift/issues/14

Steps to Reproduce:
1. Running tests with xcodebuild on a Swift 3 and Xcode 8 project with code coverage available (like https://github.com/yannickl/DynamicColor/Examples/DynamicColorExample.xcodeproj)

Expected Results:
The *.coverage.txt with the correct occurrence lines.

Actual Results:
The *.coverage.txt gives me only missed lines.

Version:
Version 8.0 (8A218a), OSX 10.11.6 (15G1004)