Make "Skip Uniform Regions" optimization in the Structurizer pass support "-opt-bisect-limit" option.

llvm/lib/Transforms/Scalar/StructurizeCFG.cpp

 
 /// Run the transformation for each region found
 bool StructurizeCFG::runOnRegion(Region *R, RGPassManager &RGM) {
   if (R->isTopLevelRegion())
     return false;
 
   DA = nullptr;
 
-  if (SkipUniformRegions) {
+  if (SkipUniformRegions && !skipRegion(*R)) {
     // TODO: We could probably be smarter here with how we handle sub-regions.
     // We currently rely on the fact that metadata is set by earlier invocations
     // of the pass on sub-regions, and that this metadata doesn't get lost --
     // but we shouldn't rely on metadata for correctness!
     unsigned UniformMDKindID =
         R->getEntry()->getContext().getMDKindID("structurizecfg.uniform");
     DA = &getAnalysis<LegacyDivergenceAnalysis>();