[S] Change in flashrom[master]: tests: Add llvm-cov option and run target for code coverage

[Anastasia Klimchuk (Code Review)]

Attention is currently required from: Thomas Heijligen, Evan Benn.

Anastasia Klimchuk has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/69268 )

Change subject: tests: Add llvm-cov option and run target for code coverage
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Patch Set 5:

(3 comments)

Patchset:

PS5: 
Thanks so much Evan for setting up coverage measurement!

File meson.build:

https://review.coreboot.org/c/flashrom/+/69268/comment/f47870ed_6a60aa6c 
PS5, Line 534: if get_option('llvm_cov')
Also need to check that tests feature is enabled

File meson_options.txt:

https://review.coreboot.org/c/flashrom/+/69268/comment/000eb271_45383df3 
PS5, Line 19: type : 'boolean'
I think this should be a feature, like unit tests themselves. Also llvm_cov feature should depend on tests feature (you can't measure coverage is tests are disabled).