[llvm] Reland: [llvm-cov][WebAssembly] Read `__llvm_prf_names` from data segments (PR #112569)

[Mike Hommey via llvm-commits]

glandium wrote:

Unfortunately, it still fails with the same error. I also noticed other error messages I had missed in the past (but after checking, they were there on the first landing):
```
LLVM Profile Error: Invalid profile data to merge
LLVM Profile Error: Profile Merging of file D:\task_172914326170851\fetches\llvm-project/build/profiles/10870457539148555413_0.profraw failed: File exists
LLVM Profile Error: Failed to write file "D:\task_172914326170851\fetches\llvm-project/build/profiles/10870457539148555413_0.profraw": File exists
```

https://github.com/llvm/llvm-project/pull/112569