fix #21523 A template function in an imported module does not inline functions annotated with pragma(inline, true)

[rainers]

inlining of a template instance must be checked on the module that generates the instance, not the source module.

Not sure how to easily setup a test for inlining. Parsing the output of '-v' is probably not compatible across different backends.

[dlang-bot]

Thanks for your pull request, @rainers!

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Testing this PR locally

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dub run digger -- build "stable + dmd#21524"