[llvm] [CAS] Add OnDiskDataAllocator (PR #161264)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-5` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/28569

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

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'Clang :: Analysis/MismatchedDeallocator-path-notes.cpp' FAILED ********************
Exit Code: 2

Command Output (stderr):
--
/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang -cc1 -internal-isystem /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/lib/clang/22/include -nostdsysteminc -analyze -setup-static-analyzer -analyzer-checker=core,unix.MismatchedDeallocator -analyzer-output=text -verify /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Analysis/MismatchedDeallocator-path-notes.cpp # RUN: at line 1
+ /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang -cc1 -internal-isystem /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/lib/clang/22/include -nostdsysteminc -analyze -setup-static-analyzer -analyzer-checker=core,unix.MismatchedDeallocator -analyzer-output=text -verify /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Analysis/MismatchedDeallocator-path-notes.cpp
/Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang -cc1 -internal-isystem /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/lib/clang/22/include -nostdsysteminc -analyze -setup-static-analyzer -analyzer-checker=core,unix.MismatchedDeallocator -analyzer-output=plist /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Analysis/MismatchedDeallocator-path-notes.cpp -o /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/tools/clang/test/Analysis/Output/MismatchedDeallocator-path-notes.cpp.tmp.plist # RUN: at line 2
+ /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/bin/clang -cc1 -internal-isystem /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/lib/clang/22/include -nostdsysteminc -analyze -setup-static-analyzer -analyzer-checker=core,unix.MismatchedDeallocator -analyzer-output=plist /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Analysis/MismatchedDeallocator-path-notes.cpp -o /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/tools/clang/test/Analysis/Output/MismatchedDeallocator-path-notes.cpp.tmp.plist
/Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Analysis/MismatchedDeallocator-path-notes.cpp:13:3: warning: Memory allocated by 'new[]' should be deallocated by 'delete[]', not 'delete' [unix.MismatchedDeallocator]
   13 |   delete p; // expected-warning {{Memory allocated by 'new[]' should be deallocated by 'delete[]', not 'delete'}}
      |   ^~~~~~~~
1 warning generated.
tail -n +11 /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/tools/clang/test/Analysis/Output/MismatchedDeallocator-path-notes.cpp.tmp.plist | grep -Ev '^[[:space:]]*<string>.* version .*</string>[[:space:]]*$|^[[:space:]]*<string>/.*</string>[[:space:]]*$|^[[:space:]]*<string>.:.*</string>[[:space:]]*$' | diff -ub /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Analysis/copypaste/Inputs/expected-plists/MismatchedDeallocator-path-notes.cpp.plist - # RUN: at line 3
+ tail -n +11 /Volumes/ExternalSSD/buildbot-root/aarch64-darwin/build/tools/clang/test/Analysis/Output/MismatchedDeallocator-path-notes.cpp.tmp.plist
+ grep -Ev '^[[:space:]]*<string>.* version .*</string>[[:space:]]*$|^[[:space:]]*<string>/.*</string>[[:space:]]*$|^[[:space:]]*<string>.:.*</string>[[:space:]]*$'
+ diff -ub /Users/buildbot/buildbot-root2/aarch64-darwin/llvm-project/clang/test/Analysis/copypaste/Inputs/expected-plists/MismatchedDeallocator-path-notes.cpp.plist -
diff: -: No space left on device

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/161264