[perf] Replace copy-assign by move-assign in llvm/lib/DWARFCFIChecker… (#178174)

… and llvm/lib/DebugInfo/*

llvm/lib/DWARFCFIChecker/DWARFCFIState.cpp

@@ -55,7 +55,7 @@ void DWARFCFIState::update(const MCCFIInstruction &Directive) {
     return;
   }
 
-  Row = NewRow;
+  Row = std::move(NewRow);
   IsInitiated = true;
 }
 

llvm/lib/DebugInfo/CodeView/DebugStringTableSubsection.cpp

@@ -22,7 +22,7 @@ DebugStringTableSubsectionRef::DebugStringTableSubsectionRef()
     : DebugSubsectionRef(DebugSubsectionKind::StringTable) {}
 
 Error DebugStringTableSubsectionRef::initialize(BinaryStreamRef Contents) {
-  Stream = Contents;
+  Stream = std::move(Contents);
   return Error::success();
 }