[clang] [Coverage] Handle array decomposition correctly (PR #88881)

[Andrey Ali Khan Bolshakov via cfe-commits]

bolshakov-a wrote:

Honestly, I'm not very familiar with code coverage technique, but it seems to me that only explicitly written code is relevant for that. "Common expression" is exactly the explicitly written part. "Subexpression" is an implicitly generated per-element initializer which refers to the "common expression" (hence, without this patch, the counters for the conditional operator from the test are duplicated despite it is executed only once per function call). Which observable drawbacks do you expect from not visiting the implicit parts of the initializer?

https://github.com/llvm/llvm-project/pull/88881