Remove unused member variable.

Fixes pr20904.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219706 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/MachineFunctionAnalysis.cpp

@@ -46,8 +46,7 @@ bool MachineFunctionAnalysis::doInitialization(Module &M) {
 bool MachineFunctionAnalysis::runOnFunction(Function &F) {
   assert(!MF && "MachineFunctionAnalysis already initialized!");
   MF = new MachineFunction(&F, TM, NextFnNum++,
-                           getAnalysis<MachineModuleInfo>(),
-                           getAnalysisIfAvailable<GCModuleInfo>());
+                           getAnalysis<MachineModuleInfo>());
   return false;
 }