Silence unused variable warning for non-asserting builds that was introduced in r198937.

llvm-svn: 198941

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

@@ -30,8 +30,8 @@
 using namespace llvm;
 
 static TargetLoweringObjectFile *createTLOF(AArch64TargetMachine &TM) {
-  const AArch64Subtarget *Subtarget = &TM.getSubtarget<AArch64Subtarget>();
-  assert (Subtarget->isTargetELF() && "unknown subtarget type");
+  assert (TM.getSubtarget<AArch64Subtarget>().isTargetELF() &&
+          "unknown subtarget type");
   return new AArch64ElfTargetObjectFile();
 }