[llvm-cov][CoverageView] add the missing condition for MC/DC in hasSubViews()

Otherwise the generated HTML will place elements unpredictably. Most
notably, the MC/DC view boxes are often placed at the page top instead
of inline next to the actual code.

Author: whentojump

llvm/tools/llvm-cov/SourceCoverageView.cpp

@@ -139,7 +139,7 @@ bool SourceCoverageView::shouldRenderRegionMarkers(
 
 bool SourceCoverageView::hasSubViews() const {
   return !ExpansionSubViews.empty() || !InstantiationSubViews.empty() ||
-         !BranchSubViews.empty();
+         !BranchSubViews.empty() || !MCDCSubViews.empty();
 }
 
 std::unique_ptr<SourceCoverageView>