[Bug] In-editor breakpoints broken because of source map discrepancies

The bug is perfecly described in https://github.com/emberjs/ember.js/issues/19401

The issue belongs to `ember-cli-htmlbars` though and I believe we need an issue in this repo as well to help things move forward.

PR https://github.com/ember-cli/ember-cli-htmlbars/pull/558 is an attempt to fix this issue but does not seem to be the right thing to do.

Leia primeiro o issue #19401 do Ember para estabelecer o breakpoint e a falha de source-map; depois, inspecione o ember-cli-htmlbars em torno do comportamento discutido na PR #558. Reproduza a discrepância e compare os mappings com as localizações esperadas pelo editor; considera-se concluído quando os breakpoints no editor são resolvidos para as posições corretas no código-fonte sem depender da abordagem rejeitada.

Escrita pelo modelo de indexação a partir do texto da issue.