[clang-tidy] SimplifyBoolenExpr doesn't add parens if unary negotiation is of ExprWit...

[clang-tidy] SimplifyBoolenExpr doesn't add parens if unary negotiation is of ExprWithCleanups type

bool foo(A &S) {
  if (S != (A)S)
    return false;
  return true;
}
is fixed into (w/o this patch)

...
return !S != (A)S; // negotiation affects first operand only
}
instead of (with this patch)

...
return S == (A)S; // note == instead of !=
}

Differential Revision: https://reviews.llvm.org/D47122

llvm-svn: 333003