llvm-cov: Fix an issue with showing regions but not counts

In r217746, though it was supposed to be NFC, I broke llvm-cov's
handling of showing regions without showing counts. This should've
shown up in the existing tests, except they were checking debug output
that was displayed regardless of what was actually output. I've moved
the relevant debug output to a more appropriate place so that the
tests catch this kind of thing.

llvm-svn: 217835
diff --git a/llvm/tools/llvm-cov/SourceCoverageView.h b/llvm/tools/llvm-cov/SourceCoverageView.h
index 37d4027..362ff1a 100644
--- a/llvm/tools/llvm-cov/SourceCoverageView.h
+++ b/llvm/tools/llvm-cov/SourceCoverageView.h
@@ -119,6 +119,9 @@
   std::vector<RegionMarker> Markers;
   StringRef FunctionName;
 
+  /// \brief Initialize the visible source range for this view.
+  void setUpVisibleRange(SourceCoverageDataManager &Data);
+
   /// \brief Create the line coverage information using the coverage data.
   void createLineCoverageInfo(SourceCoverageDataManager &Data);