[utils] Delete the 'check-coverage-regressions' script
[utils] Delete the 'check-coverage-regressions' script

In practice, it's way too noisy.

It's also a maintenance burden, since we apparently can't add tests for
it without breaking some Windows setups (see: D22692).

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@281871 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit 7b1bb280cdc44b6a13af1a5f4eaa5a63ed2ceac3)

apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm,apple/swift-llvm