Mark CFG as preserved in TypePromotion and InterleaveAccess passes

Neither of these passes modify the CFG, allowing us to preserve DomTree
and LoopInfo across them by using setPreservesCFG.

Differential Revision: https://reviews.llvm.org/D110161

llvm/lib/CodeGen/InterleavedAccessPass.cpp

@@ -95,7 +95,7 @@ public:
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.addRequired<DominatorTreeWrapperPass>();
-    AU.addPreserved<DominatorTreeWrapperPass>();
+    AU.setPreservesCFG();
   }
 
 private:

llvm/lib/CodeGen/TypePromotion.cpp

@@ -183,6 +183,7 @@ public:
   void getAnalysisUsage(AnalysisUsage &AU) const override {
     AU.addRequired<TargetTransformInfoWrapperPass>();
     AU.addRequired<TargetPassConfig>();
+    AU.setPreservesCFG();
   }
 
   StringRef getPassName() const override { return PASS_NAME; }

llvm/test/CodeGen/ARM/O3-pipeline.ll

@@ -47,8 +47,6 @@
 ; CHECK-NEXT:      Transform functions to use DSP intrinsics
 ; CHECK-NEXT:      Interleaved Access Pass
 ; CHECK-NEXT:      Type Promotion
-; CHECK-NEXT:      Dominator Tree Construction
-; CHECK-NEXT:      Natural Loop Information
 ; CHECK-NEXT:      CodeGen Prepare
 ; CHECK-NEXT:      Dominator Tree Construction
 ; CHECK-NEXT:      Exception handling preparation