Properly include reexports for implicit dependencies

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:
Resolves #3683

Description

When an implicitly dependent chunk contained reexports from other chunks that were not actually used in that chunk, then the reexporting modules were not properly linked as a dependency to the implicit entry chunk. This resulted in missing exports in some cases and weird errors in others.
This fixes this by using the same logic as for regular and dynamic entry points here (which was forgotten for implicit entry points).

[rollup-bot]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#implicit-dependent-chunk-fixes

or load it into the REPL:
https://rollupjs.org/repl/?circleci=12377

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@21cc03d). Click here to learn what that means.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #3688   +/-   ##
=========================================
  Coverage          ?   96.78%           
=========================================
  Files             ?      183           
  Lines             ?     6319           
  Branches          ?     1843           
=========================================
  Hits              ?     6116           
  Misses            ?      105           
  Partials          ?       98           

Impacted Files	Coverage Δ
src/Module.ts	100.00% <100.00%> (ø)
src/ast/variables/ExportDefaultVariable.ts	100.00% <0.00%> (ø)
src/ast/variables/ThisVariable.ts	66.66% <0.00%> (ø)
src/ast/nodes/shared/MultiExpression.ts	100.00% <0.00%> (ø)
src/ast/nodes/shared/Node.ts	96.96% <0.00%> (ø)
src/utils/options/options.ts	100.00% <0.00%> (ø)
src/utils/identifierHelpers.ts	100.00% <0.00%> (ø)
src/utils/getIndentString.ts	100.00% <0.00%> (ø)
src/ast/nodes/DoWhileStatement.ts	100.00% <0.00%> (ø)
src/utils/chunkAssignment.ts	100.00% <0.00%> (ø)
... and 174 more

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