PDB: Fix some APIs to avoid use-after-frees

The buffer is already owned by the PDBFile for all of these APIs, so
don't pass it in separately.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@285953 91177308-0d34-0410-b5e6-96231b3b80d8
7 files changed