[MC][nfc] Don't use a value after it has been std::move()'d

[int3]

update

[serge-sans-paille]

LGTM (I assume that most of the time, we're just copying pointers and it's fine either way).

[int3]

It's fine because TargetMachine doesn't define a move ctor :)

llvm/lib/CodeGen/MachineModuleInfo.cpp

void MachineModuleInfo::finalize() {
   // We don't clear the ExternalContext.
 
   delete ObjFileMMI;
   ObjFileMMI = nullptr;
 }
 
 MachineModuleInfo::MachineModuleInfo(MachineModuleInfo &&MMI)
     : TM(std::move(MMI.TM)),
-      Context(MMI.TM.getTargetTriple(), MMI.TM.getMCAsmInfo(),
-              MMI.TM.getMCRegisterInfo(), MMI.TM.getMCSubtargetInfo(), nullptr,
-              &MMI.TM.Options.MCOptions, false),
+      Context(TM.getTargetTriple(), TM.getMCAsmInfo(), TM.getMCRegisterInfo(),
+              TM.getMCSubtargetInfo(), nullptr, &TM.Options.MCOptions, false),
       MachineFunctions(std::move(MMI.MachineFunctions)) {
-  Context.setObjectFileInfo(MMI.TM.getObjFileLowering());
+  Context.setObjectFileInfo(TM.getObjFileLowering());
   ObjFileMMI = MMI.ObjFileMMI;
   CurCallSite = MMI.CurCallSite;
   ExternalContext = MMI.ExternalContext;
   TheModule = MMI.TheModule;
 }
 
 MachineModuleInfo::MachineModuleInfo(const LLVMTargetMachine *TM)
     : TM(*TM), Context(TM->getTargetTriple(), TM->getMCAsmInfo(),