[LAA] Remove unused pointer partition argument from getNumberOfChecks, NFC

This is unused after filtering checks was moved to the clients.

As a result, we can just return the number of the checks in the
precomputed set.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244369 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed