* maint:
  Fix an internal consistency check failure caused by beam_except

* john/compiler/recv-test-coverage:
  compiler: Improve test coverage for recv_crit_edges

https://bugs.erlang.org/browse/ERL-1026

* maint:
  Fix compiler crash when compiling some receive statements

The compiler would crash when compiling the following code:

    do(Acc) ->
        receive
            {Pid, abc} ->
                ok;
            {Pid, []} ->
                ok;
            {Pid, _Res} ->
                exit(_Res)
        end,
        do([Pid | Acc]).

The last clause that always raises an exception would confuse the
compiler so that it would think that the `receive` statement was at the
end of the function and it would generate incorrect code for the `do/1`
call following the `receive`.

https://bugs.erlang.org/browse/ERL-1022

* john/compiler/fix-bs_skip-succeeded-oddity:
  compiler: Fix awkward match context substitution
  beam_ssa_lint: Use #b_var{} instead of variable names

* john/compiler/remove-dead-code-beam_ssa_type:
  beam_ssa_type: Remove unreachable code

Expand and squeeze literal integers/utf8 bin segments

This worked out by accident since codegen never actually looks at
the arguments for 'succeeded'; it just assumes that they reference
the preceding instruction.