Revert "[Coverage] Clarify ownership of a MemoryBuffer in the reader (NFC)"

This reverts commit 1037ef2574adde2103ad221d63834c3e1df4a776.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274105 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed