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

[Yuta Saito via llvm-commits]

kateinoigakukun wrote:

@glandium Would you mind testing this patch with your PGO setup? :pray:

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