Files
bitcoin/src/test/fuzz
merge-script c20a5ce106 Merge bitcoin/bitcoin#31901: contrib: Add deterministic-unittest-coverage
fa99c3b544 test: Exclude SeedStartup from coverage counts (MarcoFalke)
fa579d663d contrib: Add deterministic-unittest-coverage (MarcoFalke)
fa3940b1cb contrib: deterministic-fuzz-coverage fixups (MarcoFalke)
faf905b9b6 doc: Remove unused -fPIC (MarcoFalke)
fa1e0a7228 gitignore: target/ (MarcoFalke)

Pull request description:

  The `contrib/devtools/test_deterministic_coverage.sh` script is problematic:

  * It is written in bash. This can lead to issues when running with the ancient bash version shipped by macOS by default, or can lead to other compatibility issues, such as https://github.com/bitcoin/bitcoin/pull/31588#discussion_r1946784827. Also, pipefail isn't set, so IO errors may be silently ignored.
  * It is based on gcov. This can lead to issues, such as https://github.com/bitcoin/bitcoin/pull/31588#pullrequestreview-2602169248 (possibly due to prefix-map), or https://github.com/bitcoin/bitcoin/pull/31588#issuecomment-2646395385 (gcovr processing error), or https://github.com/bitcoin/bitcoin/pull/31588#pullrequestreview-2605954001 (gcovr assertion error).
  * The script is severely outdated, with the last update to `NON_DETERMINISTIC_TESTS` being in the prior decade.

  Instead of patching around all issues one-by-one, just provide a fresh rewrite, based on the recently added `deterministic-fuzz-coverage` tool based on clang, llvm-cov, and llvm-profdata. (Initial feedback indicates that this is a more promising attempt: https://github.com/bitcoin/bitcoin/pull/31588#issuecomment-2649356408 and https://github.com/bitcoin/bitcoin/pull/31588#issuecomment-2649354598).

  The new tool also sets `RANDOM_CTX_SEED=21` as suggested by hodlinator in https://github.com/bitcoin/bitcoin/pull/31588#issuecomment-2650784726.

ACKs for top commit:
  Prabhat1308:
    Concept ACK [`fa99c3b`](fa99c3b544)
  hodlinator:
    re-ACK fa99c3b544
  brunoerg:
    light ACK fa99c3b544
  dergoegge:
    tACK fa99c3b544
  janb84:
    Concept ACK [fa99c3b](fa99c3b544)

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