[clang] [CIR][NFC] Use tablegen to create CIRAttrToValue visitor declarations (PR #187607)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-ppc64le-linux-test-suite` running on `ppc64le-clang-test-suite` while building `clang` at step 3 "clean-build-dir".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/95/builds/20571

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

```
Step 3 (clean-build-dir) failure: Delete failed. (failure) (timed out)
Step 6 (test-build-unified-tree-check-all) failure: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
...
246.427 [1/9/1348] Linking CXX executable unittests/tools/llvm-mca/LLVMMCATests
260.257 [1/8/1349] Linking CXX executable unittests/Analysis/AnalysisTests
262.046 [1/7/1350] Linking CXX executable tools/clang/tools/extra/unittests/clang-doc/ClangDocTests
263.480 [1/6/1351] Linking CXX executable tools/clang/unittests/Sema/SemaTests
265.589 [1/5/1352] Linking CXX executable tools/clang/unittests/ScalableStaticAnalysisFramework/ClangScalableAnalysisTests
280.964 [1/4/1353] Linking CXX executable tools/clang/tools/extra/unittests/clang-tidy/ClangTidyTests
365.044 [1/3/1354] Linking CXX executable tools/clang/unittests/Interpreter/ClangReplInterpreterTests
386.352 [1/2/1355] Linking CXX executable tools/clang/tools/extra/clangd/unittests/ClangdTests
420.590 [1/1/1356] Linking CXX executable tools/clang/unittests/AllClangUnitTests
420.592 [0/1/1356] Running all regression tests
command timed out: 1200 seconds without output running [b'ninja', b'check-all'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1621.941491

```

</details>

https://github.com/llvm/llvm-project/pull/187607