Update enum debuginfo tests

Bug #52452 notes some debuginfo test regressions when moving to gdb
8.1.  This series will also cause versions of gdb before 8.2 to fail
when a recent LLVM is used -- DW_TAG_variant_part support was not
added until 8.2.

This patch updates one of the builders to a later version of Ubuntu,
which comes with gdb 8.2.  It updates the relevant tests to require
both a new-enough LLVM and a new-enough gdb; the subsequent patch
arranges to continue testing the fallback mode.

The "gdbg" results are removed from these tests because the tests now
require a rust-enabled gdb.

If you read closely, you'll see that some of the lldb results in this
patch still look a bit strange.  This will be addressed in a
subsequent patch; I believe the fix is to disable the Python
pretty-printers when lldb is rust-enabled.

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