0a433fc876d82df1005f175c1254fff62f0f36f8 [validation] Remove unused cacheSigStore from CheckInputsFromMempoolAndCache (John Newbery)
Pull request description:
CheckInputsFromMempoolAndCache() is only called in one place, and cacheSigStore is set to true in that call site. Remove the argument entirely. Also improve commenting.
Backport of Core PR17242