[llvm] [CAS] Add OnDiskGraphDB and OnDiskKeyValueDB (PR #114102)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-expensive-checks-win` running on `as-worker-93` while building `llvm` at step 7 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/14/builds/4508

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 7 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM-Unit :: CAS/./CASTests.exe/4/24' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:C:\a\llvm-clang-x86_64-expensive-checks-win\build\unittests\CAS\.\CASTests.exe-LLVM-Unit-12972-4-24.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=24 GTEST_SHARD_INDEX=4 C:\a\llvm-clang-x86_64-expensive-checks-win\build\unittests\CAS\.\CASTests.exe
--

Note: This is test shard 5 of 24.

[==========] Running 1 test from 1 test suite.

[----------] Global test environment set-up.

[----------] 1 test from OnDiskCASTest

[ RUN      ] OnDiskCASTest.OnDiskGraphDBSpaceLimit

C:\a\llvm-clang-x86_64-expensive-checks-win\llvm-project\llvm\unittests\CAS\OnDiskGraphDBTest.cpp(301): error: Value of: llvm::detail::TakeError(store(*DB, Data, Refs).moveInto(ID))

Expected: succeeded

  Actual: failed  (invalid argument)



C:\a\llvm-clang-x86_64-expensive-checks-win\llvm-project\llvm\unittests\CAS\OnDiskGraphDBTest.cpp(301): error: Value of: llvm::detail::TakeError(store(*DB, Data, Refs).moveInto(ID))

Expected: succeeded

  Actual: failed  (invalid argument)



C:\a\llvm-clang-x86_64-expensive-checks-win\llvm-project\llvm\unittests\CAS\OnDiskGraphDBTest.cpp(301): error: Value of: llvm::detail::TakeError(store(*DB, Data, Refs).moveInto(ID))

Expected: succeeded

  Actual: failed  (invalid argument)



C:\a\llvm-clang-x86_64-expensive-checks-win\llvm-project\llvm\unittests\CAS\OnDiskGraphDBTest.cpp(301): error: Value of: llvm::detail::TakeError(store(*DB, Data, Refs).moveInto(ID))

Expected: succeeded

  Actual: failed  (invalid argument)



C:\a\llvm-clang-x86_64-expensive-checks-win\llvm-project\llvm\unittests\CAS\OnDiskGraphDBTest.cpp(301): error: Value of: llvm::detail::TakeError(store(*DB, Data, Refs).moveInto(ID))

...

```

</details>

https://github.com/llvm/llvm-project/pull/114102