The issue was with continue and break, where a previous loop was
decrementing the breakDepth/continueDepth before we started
incrementing it.

BUG=18069149

Change-Id: I39fa9c07ea373cd9dab4997bfb8a9e621bf48b29
Reviewed-on: https://swiftshader-review.googlesource.com/1473Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>