In this entry, the first list of files is the inherit-product stack, and
the second one is the list of files included by the file at the top of
the stack that just finished processing
Test: build/make/ci/dump_product_config
Change-Id: I826b1ec6fa1319b8f0cdfaacc6ccf999ce93d9f1
Doesn't include tests. More of those will come later.
Test: build/make/tools/product_config/test.sh
Change-Id: Icd2b455ac5f7b4773ba332fc40e994dc6f024f1b
