Fix Issue 19014 - Compiler imports symbols that aren't actually imported

[JinShil]

Adds a test to verify fix for https://issues.dlang.org/show_bug.cgi?id=19014 When this is pulled the bug can be closed.

@braddr The fix will be released with 2.084? Any chance we can get the autotester updated with 2.084 at that time. This bug is holding up dlang/druntime#2399

[dlang-bot]

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	19014	normal	Compiler imports symbols that aren't actually imported.

Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub fetch digger
dub run digger -- build "master + dmd#9050"