[PATCH] Add readability-remove-void-arg check to clang-tidy

[Samuel Benzaquen]

================
Comment at: clang-tidy/readability/RemoveVoidArg.cpp:42
@@ +41,3 @@
+  if (const auto PT = QT->getAs<PointerType>()) {
+    if (const auto FP = PT->getPointeeType()->getAs<FunctionProtoType>()) {
+      return FP->getNumParams() == 0;
----------------
Remove the duplicate logic.
Could be something like:

```
if (const auto PT = QT->getAs<PointerType>()) {
  QT = PT->getPointeeType();
}
if (const auto *MPT = QT->getAs<MemberPointerType>()) {
  QT = MPT->getPointeeType();
}
if (const auto FP = QT->getAs<FunctionProtoType>()) {
    return FP->getNumParams() == 0;
}
```

http://reviews.llvm.org/D7639

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