The `sys_core_fold` pass of the compiler would optimize
away the building of the stacktrace in code such as:

    try
        ...
    catch
        C:R:Stk ->
           erlang:raise(C, {R,Stk}, Stk)
    end

That optimization is unsafe and would cause a crash in a later compiler
pass.

There could be an internal consistency failure when using is_function/2,
because an optimization did not take into account that is_function/2 can fail.

https://bugs.erlang.org/browse/ERL-778

`beam_jump` could remove a `put_tuple` instruction when the
tuple would not be used, but it would leave the following
`put` instructions. Make sure they are removed.

https://bugs.erlang.org/browse/ERL-759

* john/compiler/bs_match-anno-liveness-fix/OTP-15353/ERL-753:
  beam_utils: Handle bs_start_match2 in anno_defs

The source file path as given to `erlc` was included in an implicit
file attribute inserted by epp, even when the +source flag was
set to something else which was a bit surprising. It was also
included when +deterministic was specified, breaking the flag's
promise.

This commit forwards the +source flag to epp so it inserts the
right information, and if +deterministic is given it will be shaved
to just the base name of the file, guaranteeing the same result
regardless of how the input is reached.

2e40d8d1c51a attempted fix a bug in binary matching, but it only
fixed the bug for the minimized test case.

This commit removes the previous fix and fixes the bug in a more
effective way. See the comments in the new code in `sys_core_bsm`
for an explanation.

This commit restores the optimizations in string.erl and dets_v9.erl
that the previous fix disabled.

I have not found any code where this commit will disable optimizations
when they are actually safe. There are some changes to the code
in ssl_cipher.erl in that some bs_start_match2 instruction did not
reuse the binary register for the match context, but the delayed
sub binary optimizations was never applied to the code in the first
place.

https://bugs.erlang.org/browse/ERL-689

* maint-21:
  Updated OTP version
  Update release notes
  Update version numbers
  erts: Fix "Prevent inconsistent node lists" fix
  Fix include-path regression caused by dd0a39c
  Restore default SIGTERM behaviour for port programs

Include paths don't actually affect code generation in any way, but
it's reasonable for a build tool like rebar3 to recompile when the
include paths change. This commit restores the old behavior without
the +deterministic flag.

* hasse/dialyzer/improve_guards/OTP-15268/ERL-680:
  dialyzer: Improve handling of complex guards