Log Message:
elixir: update to 1.12.2

1. Bug fixes

Elixir

    [Kernel] Ensure deprecated macros emit warnings

Mix

    [mix deps] Ensure unconstrained rebar deps generate valid mix specifications

2. Enhancements

Elixir

    [elixirc] Change the output of --profile time to make it easier to detect \ 
outliers
    [Application] Do not add compile time deps on args to \ 
Application.compile_env/2 and Application.compile_env!/2
    [Enum] Optimize Enum.into/3 and Map.new/2

Mix

    [mix compile] Compile most recently changed files first
    [mix compile, mix run, mix test] Speed up the time taken to load \ 
dependencies. This should make the usage of Mix inside projects quite more \ 
responsive