Restore preserved pass specification in DXILPrepare

Add precise paases preserved in DXILTranslateMetadata instead of setPreservesAll()

Author: bharadwajy

llvm/lib/Target/DirectX/DXILPrepare.cpp

@@ -247,8 +247,11 @@ class DXILPrepareModule : public ModulePass {
 
   DXILPrepareModule() : ModulePass(ID) {}
   void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.setPreservesAll();
     AU.addRequired<DXILMetadataAnalysisWrapperPass>();
+    AU.addPreserved<ShaderFlagsAnalysisWrapper>();
+    AU.addPreserved<DXILResourceMDWrapper>();
+    AU.addPreserved<DXILMetadataAnalysisWrapperPass>();
+    AU.addPreserved<DXILResourceWrapperPass>();
   }
   static char ID; // Pass identification.
 };

llvm/lib/Target/DirectX/DXILTranslateMetadata.cpp

@@ -379,11 +379,13 @@ class DXILTranslateMetadataLegacy : public ModulePass {
   StringRef getPassName() const override { return "DXIL Translate Metadata"; }
 
   void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.setPreservesAll();
     AU.addRequired<DXILResourceWrapperPass>();
     AU.addRequired<DXILResourceMDWrapper>();
     AU.addRequired<ShaderFlagsAnalysisWrapper>();
     AU.addRequired<DXILMetadataAnalysisWrapperPass>();
+    AU.addPreserved<DXILResourceWrapperPass>();
+    AU.addPreserved<DXILResourceMDWrapper>();
+    AU.addPreserved<DXILMetadataAnalysisWrapperPass>();
   }
 
   bool runOnModule(Module &M) override {