Merge #18401: Refactor: Initialize PrecomputedTransactionData in CheckInputScripts

f63dec189c3c8eee1ab2187681d5d0b2513b1b2e [REFACTOR] Initialize PrecomputedTransactionData in CheckInputScripts (Pieter Wuille)

Pull request description:

  This is a single commit taken from the Schnorr/Taproot PR #17977.

  Add a default constructor to `PrecomputedTransactionData`, which doesn't initialize the struct's members. Instead they're initialized inside the `CheckInputScripts()` function. This allows a later commit to add the spent UTXOs to that structure. The spent UTXOs are required for the schnorr signature hash, since it commits to the scriptPubKeys. See https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki#common-signature-message for details.

  By itself, this isn't really an improvement to the code, but I think it makes sense to separate out the refactor/moveonly commits from PR #17977 so that PR is only the logical changes needed for Schnorr/Taproot.

ACKs for top commit:
  jonatack:
    Re-ACK f63dec1  `git diff 851908d f63dec1` shows no change since last ACK.
  sipa:
    utACK f63dec189c3c8eee1ab2187681d5d0b2513b1b2e
  theStack:
    re-ACK f63dec189c3c8eee1ab2187681d5d0b2513b1b2e
  fjahr:
    Re-ACK f63dec189c3c8eee1ab2187681d5d0b2513b1b2e
  ariard:
    Code Review ACK f63dec1

Tree-SHA512: ecf9154077824ae4c274b4341e985797f3648c0cb0c31cb25ce382163b923a3acbc7048683720be4ae3663501801129cd0f48c441a36f049cc304ebe9f30994e

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