[6.0🍒] Revert "On 'canImport' of Clang submodules of modules with an umbrella header, attempt to infer the submodule" #72880
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Cherry-pick of #72879
Reverts #72129 from the
release/6.0
branch.Explanation: This change had an unintended breaking effect - it causes
#canImport
clauses with non-existing submodules to succeed, at times.Risk: Low. This change reverts a recent bugfix that turned out to be incomplete. The bug it fixed had been around for years, so this just reverts things to the status-quo.
Testing: Original change had an automated test which this PR reverts. Since this gets us back to where we were prior to this change, no additional testing is required.
Reviewed By: @cachemeifyoucan