[code-reflection] RFR: Add buffer tagging and opt-out moduleOp backend

[Ruby Chen]

Add a tool to tag kernel buffers with RO, WO, RW, or NA. 

Currently, the result of the buffer tagger is only used to assert that it matches with the respective buffer annotations in the HAT kernels. 

Also make moduleOp an opt-out backend for HAT, which can be disabled by passing the flag `noModuleOp` when running HAT. For example, running the mandel example with the ffi-opencl backend and moduleOp disabled can be done with

java @hat/run noModuleOp ffi-opencl mandel

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Commit messages:
 - Clean up BufferTagger
 - Merge branch 'openjdk:code-reflection' into buffer-tagging
 - Merge branch 'openjdk:code-reflection' into buffer-tagging
 - Add buffer tagging and opt-out moduleOp backend

Changes: https://git.openjdk.org/babylon/pull/548/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=548&range=00
  Stats: 272 lines in 10 files changed: 240 ins; 18 del; 14 mod
  Patch: https://git.openjdk.org/babylon/pull/548.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/548/head:pull/548

PR: https://git.openjdk.org/babylon/pull/548