Make a copy of PrecomputedTransactionData in the CScriptCheck

Summary: This ensure that each CScriptCheck has its own PrecomputedTransactionData which makes consideration about multithreading irrelevent to the outside world.

Test Plan:

make check
../qa/pull-tester/rpc-tests.py -extended

Reviewers: freetrader, sickpig, awemany, kyuupichan, #bitcoin_abc

Reviewed By: kyuupichan, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D297