Remove the last mention of LineTablesOnly from DwarfUnit, sinking it into DwarfCompileUnit
This is a useful distinction/invariant/delination to make because
LineTablesOnly mode is never relevant to type units, so it's clear that
we're not doing weird line-tables-only-with-types by making this API
choice.
It also lays the foundations nicely for adding gmlt-like data to fission
skeleton CUs while limiting the effects to CUs and not TUs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221093
91177308-0d34-0410-b5e6-
96231b3b80d8
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