Reduce extra object creations in TaggedLogging

tags_text method creates 3 Ruby objects per each logger call when no custom tags are given
(which is the default setting, and so presumably the majority use case).
This patch reduces two temporary object creations in this case.

    require 'allocation_tracer'
    ObjectSpace::AllocationTracer.setup(%i{type})

    tags = ['a']

    pp before: ObjectSpace::AllocationTracer.trace {
      tags.collect { |tag| "[#{tag}] " }.join
    }

    pp after: ObjectSpace::AllocationTracer.trace {
      "[#{tags[0]}] "
    }

    {:before=>{[:T_ARRAY]=>[1, 0, 0, 0, 0, 0], [:T_STRING]=>[2, 0, 0, 0, 0, 0]}}
    {:after=>{[:T_STRING]=>[1, 0, 0, 0, 0, 0]}}

0 files changed, 0 insertions, 0 deletions