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

[Richard]

Document transformations applied to replacement expression.

Replace implicit pointer to boolean conversions with explicit comparison to `nullptr`.


http://reviews.llvm.org/D9810

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

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