[NFC] minor cleanup in PassManagerInternal.h

A few changes found necessary for upcoming PassInstrumentation patch:
  - name() methods made const
  - properly forward arguments in AnalysisPassModel::run

Separated out of the main D47858 patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@342325 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed