[llvm] [SandboxIR] Add more Instruction member functions (PR #98588)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ml-opt-rel-x86-64` running on `ml-opt-rel-x86-64-b2` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/185/builds/1817

Here is the relevant piece of the build log for the reference:
```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM-Unit :: SandboxIR/./SandboxIRTests/7/8' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/b/ml-opt-rel-x86-64-b1/build/unittests/SandboxIR/./SandboxIRTests-LLVM-Unit-1476574-7-8.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=8 GTEST_SHARD_INDEX=7 /b/ml-opt-rel-x86-64-b1/build/unittests/SandboxIR/./SandboxIRTests
--

Note: This is test shard 8 of 8.
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from SandboxIRTest
[ RUN      ] SandboxIRTest.Instruction
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH or set the environment var `LLVM_SYMBOLIZER_PATH` to point to it):
0  SandboxIRTests  0x00005628b1700b88
1  SandboxIRTests  0x00005628b16fe49c
2  libpthread.so.0 0x00007f0ef042a140
3  SandboxIRTests  0x00005628b160277e
4  SandboxIRTests  0x00005628b15461b2
5  SandboxIRTests  0x00005628b14dd5c0
6  SandboxIRTests  0x00005628b17142df
7  SandboxIRTests  0x00005628b171c1e2
8  SandboxIRTests  0x00005628b171c7c7
9  SandboxIRTests  0x00005628b1729826
10 SandboxIRTests  0x00005628b171384c
11 SandboxIRTests  0x00005628b14cb0a6
12 libc.so.6       0x00007f0eeff35d0a __libc_start_main + 234
13 SandboxIRTests  0x00005628b14cf01a

--
exit: -11
--
shard JSON output does not exist: /b/ml-opt-rel-x86-64-b1/build/unittests/SandboxIR/./SandboxIRTests-LLVM-Unit-1476574-7-8.json
********************


```

https://github.com/llvm/llvm-project/pull/98588