[M] Change in flashrom[master]: tests: Detect llvm-cov file io and unmock io functions

[Evan Benn (Code Review)]

Attention is currently required from: Anastasia Klimchuk.

Hello build bot (Jenkins), Anastasia Klimchuk,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/flashrom/+/69267

to look at the new patch set (#3).

Change subject: tests: Detect llvm-cov file io and unmock io functions
......................................................................

tests: Detect llvm-cov file io and unmock io functions

Code coverage writes data to disk atexit of the program. We need to
unmock the file io at this point so that the data is really written.

BUG=b:187647884
BRANCH=None
TEST=meson test
TEST=llvm-profdata merge -sparse default.profraw -o default.profdata
TEST=llvm-cov show ./flashrom_unit_tests
-instr-profile=default.profdata --format=html --output-dir=.

Change-Id: I21cc1d631e92fa19006b967e85676f108e80b307
Signed-off-by: Evan Benn 
---
M Documentation/building.md
M tests/tests.c
M tests/wraps.h
3 files changed, 56 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/67/69267/3