[llc] Remove an unnecessary cast (NFC) (#151085)

getObjFileLowering() already returns TargetLoweringObjectFile *.

Author: kazutakahirata

llvm/tools/llc/llc.cpp

@@ -733,8 +733,8 @@ static int compileModule(char **argv, LLVMContext &Context) {
         reportError("target does not support generation of this file type");
     }
 
-    const_cast<TargetLoweringObjectFile *>(Target->getObjFileLowering())
-        ->Initialize(MMIWP->getMMI().getContext(), *Target);
+    Target->getObjFileLowering()->Initialize(MMIWP->getMMI().getContext(),
+                                             *Target);
     if (MIR) {
       assert(MMIWP && "Forgot to create MMIWP?");
       if (MIR->parseMachineFunctions(*M, MMIWP->getMMI()))