[PATCH] Enhance clang-tidy readability-simplify-boolean-expr to handle 'if (e) return true; return false; '

[Richard]

When the replacement text is already a negated rexpression, `!expr`, and we're negating it again, use `expr`, not `!!expr` as the replacement.


http://reviews.llvm.org/D9810

Files:
  clang-tidy/readability/SimplifyBooleanExprCheck.cpp
  clang-tidy/readability/SimplifyBooleanExprCheck.h
  test/clang-tidy/readability-simplify-bool-expr.cpp

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