[PATCH] [clang-tidy] Add a check for RAII temporaries.

[Benjamin Kramer]

- Added FixIts. This is tricky because we have to remove the parens when encountering
     Foo(); // Foo is a type.
  -> Foo give_me_a_name;
otherwise it'll parse as a function decl.
- Added another way of reducing false positives: If the expression is the last one in
the compoundStmt we don't warn, as it doesn't change behavior.

http://reviews.llvm.org/D4615

Files:
  clang-tidy/misc/CMakeLists.txt
  clang-tidy/misc/MiscTidyModule.cpp
  clang-tidy/misc/UnusedRAII.cpp
  clang-tidy/misc/UnusedRAII.h
  test/clang-tidy/misc-unused-raii.cpp
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