[PATCH] Add readability-simplify-boolean-expr check to clang-tidy

[Richard]

Hi alexfh,

This check looks for comparisons between boolean expressions and boolean constants and simplifies them to just use the appropriate boolean expression directly.

`if (b == true)` becomes `if (b)`
`if (b == false)` becomes `if (!b)`
`if (b && true)` becomes `if (b)`
`if (b && false)` becomes `if (false)`
`if (b || true)` becomes `if (true)`
`if (b || false)` becomes `if (b)`
`e ? true : false` becomes `e`
`e ? false : true` becomes `!e`
`if (true) t(); else f();` becomes `t();`
`if (false) t(); else f();` becomes `f();`

http://reviews.llvm.org/D7648

Files:
  clang-tidy/readability/CMakeLists.txt
  clang-tidy/readability/ReadabilityTidyModule.cpp
  clang-tidy/readability/SimplifyBooleanExpr.cpp
  clang-tidy/readability/SimplifyBooleanExpr.h
  test/clang-tidy/readability-simplify-bool-expr.cpp

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