Remove unused private fields found by clang's new -Wunused-private-field.

There are some that I didn't remove this round because they looked like
obvious stubs. There are dead variables in gtest too, they should be
fixed upstream.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158090 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/FastISelEmitter.cpp

@@ -867,6 +867,6 @@ void FastISelEmitter::run(raw_ostream &OS) {
 }
 
 FastISelEmitter::FastISelEmitter(RecordKeeper &R)
-  : Records(R), CGP(R) {
+  : CGP(R) {
 }
 

utils/TableGen/FastISelEmitter.h

@@ -25,7 +25,6 @@ class CodeGenTarget;
 /// and emission of the instruction selector.
 ///
 class FastISelEmitter : public TableGenBackend {
-  RecordKeeper &Records;
   CodeGenDAGPatterns CGP;
 public:
   explicit FastISelEmitter(RecordKeeper &R);