Fixup dtrace build of default_engine

Change-Id: Ib2af3784c130d9d8e951aebbc942c789e9d1f0a9
Reviewed-on: http://review.couchbase.org/40131
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>
MB-11846: Un-disable optimization as it causes compiler memory explosion (partial revert of 4bb252a2a7d9a369c80f8db71b3b5dc1c9f47eb9)
Change-Id: I0840515f6e29c3daddb66f8622d2d46a3492e596
Reviewed-on: http://review.couchbase.org/40153
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>
Merge remote-tracking branch 'membase/3.0'

* membase/3.0:
  MB-11846: Un-disable optimization as it causes compiler...
  Fixup dtrace build of default_engine

Change-Id: I6db28ac0f5966d9021bb003fef3af681abba67c8