data_smart: Improve performance of infer_caller_details()

As things stand now, bitbake -e (which turns on all the caller tracking)
of OE-Core generates around 9.5 million stat calls which is slow and the
largest single thing on the profile data.

This is because infer_caller_details() calls traceback.extract_stack()
which adds line contents to the traceback. This in turn calls python's
internal linecache code which calls stat on every file for every callback.
We don't even use that info. We only even want a single frame of the stack.

Instead, open code for the pieces of information we need. Also, only
obtain the stack once for both halves of the infer_caller_details()
code.

This reduces the number of stat calls to around 0.5 million and significantly
improves parsing with bitbake -e.

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

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