ReleaseNotes: clang-tidy changes; by Alexander Kornienko

* Several cases of ABI incompatibility with GCC have been fixed.

clang-tidy

----------

Added new checks:

  * google-global-names-in-headers: flag global namespace pollution in header

    files.

  * misc-assert-side-effect: detects `assert()` conditions with side effects

    which can cause different behavior in debug / release builds.

  * misc-assign-operator-signature: finds declarations of assign operators with

    the wrong return and/or argument types.

  * misc-inaccurate-erase: warns when some elements of a container are not

    removed due to using the `erase()` algorithm incorrectly.

  * misc-inefficient-algorithm: warns on inefficient use of STL algorithms on

    associative containers.

  * misc-macro-parentheses: finds macros that can have unexpected behavior due

    to missing parentheses.

  * misc-macro-repeated-side-effects: checks for repeated argument with side

    effects in macros.

  * misc-noexcept-move-constructor: flags user-defined move constructors and

    assignment operators not marked with `noexcept` or marked with

    `noexcept(expr)` where `expr` evaluates to `false` (but is not a `false`

    literal itself).

  * misc-static-assert: replaces `assert()` with `static_assert()` if the

    condition is evaluatable at compile time.

  * readability-container-size-empty: checks whether a call to the `size()`

    method can be replaced with a call to `empty()`.

  * readability-else-after-return: flags conditional statements having the

    `else` branch, when the `true` branch has a `return` as the last statement.

  * readability-redundant-string-cstr: finds unnecessary calls to

    `std::string::c_str()`.

  * readability-shrink-to-fit: replaces copy and swap tricks on shrinkable

    containers with the `shrink_to_fit()` method call.

  * readability-simplify-boolean-expr: looks for boolean expressions involving

    boolean constants and simplifies them to use the appropriate boolean

    expression directly (`if (x == true) ... -> if (x)`, etc.)

Core Analysis Improvements

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