This reverts commit c9930022.

The original CL skipped the lldb test if it couldn't read compressed
DWARF, but lldb can never read compressed DWARF, so this effectively
disabled this test unconditionally.

The previous commit disabled DWARF compression for this test, so the
test now works on its own merits again. This CL reverts the change to
skip the test so we don't simply mask lldb failures.

Updates #25925.

Change-Id: I3e1c787b658257b542c3c70807065dde9cfe05ee
Reviewed-on: https://go-review.googlesource.com/124386
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>