[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 `lld-x86_64-ubuntu-fast` running on `as-builder-4` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/33/builds/794

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:/home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/build/unittests/SandboxIR/./SandboxIRTests-LLVM-Unit-1308350-7-8.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=8 GTEST_SHARD_INDEX=7 /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/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 0x0000565411904410
1  SandboxIRTests 0x0000565411901d1f
2  SandboxIRTests 0x0000565411901e75
3  libc.so.6      0x00007f8e5ff69520
4  SandboxIRTests 0x0000565411801182
5  SandboxIRTests 0x00005654117406be
6  SandboxIRTests 0x00005654116d3ef6
7  SandboxIRTests 0x000056541191a643
8  SandboxIRTests 0x0000565411924ea2
9  SandboxIRTests 0x0000565411925441
10 SandboxIRTests 0x000056541192fdba
11 SandboxIRTests 0x00005654119199bf
12 SandboxIRTests 0x00005654116c2a3a
13 libc.so.6      0x00007f8e5ff50d90
14 libc.so.6      0x00007f8e5ff50e40 __libc_start_main + 128
15 SandboxIRTests 0x00005654116c66a5

--
exit: -11
--
shard JSON output does not exist: /home/buildbot/worker/as-builder-4/ramdisk/lld-x86_64/build/unittests/SandboxIR/./SandboxIRTests-LLVM-Unit-1308350-7-8.json
********************


```

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