StructurizeCFG: Add dependency on LowerSwitch pass

Switch instructions were crashing the StructurizeCFG pass, and it's
probably easier anyway if we don't need to handle them in this pass.

Reviewed-by: Christian König <christian.koenig@amd.com>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191841 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/StructurizeCFG.cpp b/lib/Transforms/Scalar/StructurizeCFG.cpp
index bb6f163..72fea80 100644
--- a/lib/Transforms/Scalar/StructurizeCFG.cpp
+++ b/lib/Transforms/Scalar/StructurizeCFG.cpp
@@ -231,7 +231,7 @@
 
   StructurizeCFG() :
     RegionPass(ID) {
-    initializeRegionInfoPass(*PassRegistry::getPassRegistry());
+    initializeStructurizeCFGPass(*PassRegistry::getPassRegistry());
   }
 
   using Pass::doInitialization;
@@ -244,6 +244,7 @@
   }
 
   void getAnalysisUsage(AnalysisUsage &AU) const {
+    AU.addRequiredID(LowerSwitchID);
     AU.addRequired<DominatorTree>();
     AU.addPreserved<DominatorTree>();
     RegionPass::getAnalysisUsage(AU);
@@ -256,6 +257,7 @@
 
 INITIALIZE_PASS_BEGIN(StructurizeCFG, "structurizecfg", "Structurize the CFG",
                       false, false)
+INITIALIZE_PASS_DEPENDENCY(LowerSwitch)
 INITIALIZE_PASS_DEPENDENCY(DominatorTree)
 INITIALIZE_PASS_DEPENDENCY(RegionInfo)
 INITIALIZE_PASS_END(StructurizeCFG, "structurizecfg", "Structurize the CFG",