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

[Richard]

After sorting out some things with the clang tree for testing, I discovered that the code had errors.  This diff corrects them.

Specifically `compoundStmt(hasAnySubstatement(ifStmt()))` will always match the first `if` statement in a compound statement.  The matcher will not be invoked for each `if` statement in the block.  So when a block contains chained `if` statements like:

  if (i < 5) return false;
  if (i > 10) return true;
  return false;

The first `if` statement would have been matched, but then determined that it did not immediately precede the `return` statement and the entire block would be left alone.  The consequence is that I can use a matcher that finds all compound statements containing both an `if` statement and a `return` statement, but I then have to iterate over the compound statement manually to locate the `if` immediately preceding the `return`.  Test cases have been added to cover this situation.  Running the check on clang/LLVM code now does the sensible thing.


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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