bitbake: codeparser: Avoid log bufer overhead in cache case

Creating the new log instances triggers a lot of python logging overhead
in a commonly called function (about 600,000 for parsing OE-Core).

We only need the log functionality if we're parsing, not if we just hit
from the cache. Therefore defer the log setup overhead until we know it
is a cache miss.

Whilst this complicates the code slightly, the performance gain is worth
it as for parsing OE-Core we drop 60 million funciton calls (from 225
overall).

(Bitbake rev: ac868167ad854f9bb32dcb2e63528870547805a7)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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