swift234

[Coverage] Fix handling of abnormal exits through repeat blocks

We do not correctly update the counter expression for conditionals in
repeat-while blocks in the following two situations:

Situation 1:

repeat {     // Region 1
  if (C1) {  // Region 2
    break
  }
} while C2   // Should be "Region 1 - Region 2", not "Region 1"

Situation 2:

repeat {     // Region 1
  if (C1) {  // Region 2
    continue
  }
} while C2   // Should be "Region 1", not "Region 1 + Region 2"

Fix both of these problems and add thorough regression tests.

Closes Swift PR #1244, rdar://problem/24572268