[PATCH] [clang-tidy] Add a checker for code that looks like a delegate constructors but doesn't delegate.

[Benjamin Kramer]

Hi alexfh, djasper,

class Foo {
  Foo() {
    Foo(42); // oops
  }
  Foo(int);
};

This is valid code but it does nothing and we can't emit a warning in clang
because there might be side effects. The checker emits a warning for this
pattern and also for base class initializers written in this style.

There is some overlap with the unused-rtti checker but they follow different
goals and fire in different places most of the time.

http://reviews.llvm.org/D4667

Files:
  clang-tidy/misc/CMakeLists.txt
  clang-tidy/misc/MiscTidyModule.cpp
  clang-tidy/misc/UndelegatedConstructor.cpp
  clang-tidy/misc/UndelegatedConstructor.h
  test/clang-tidy/misc-undelegated-constructor.cpp
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