[llvm] [SandboxIR] Add more functions to sandboxir:Instruction class. (PR #110050)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-x86_64-debian-dylib` running on `gribozavr4` while building `llvm` at step 7 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/60/builds/8673

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

```
Step 7 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM-Unit :: SandboxIR/./SandboxIRTests/32/131' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/b/1/llvm-x86_64-debian-dylib/build/unittests/SandboxIR/./SandboxIRTests-LLVM-Unit-4103137-32-131.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=131 GTEST_SHARD_INDEX=32 /b/1/llvm-x86_64-debian-dylib/build/unittests/SandboxIR/./SandboxIRTests
--

Script:
--
/b/1/llvm-x86_64-debian-dylib/build/unittests/SandboxIR/./SandboxIRTests --gtest_filter=SandboxIRTest.Instruction
--
warning: ignoring debug info with an invalid version (0) in <string>
/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/unittests/SandboxIR/SandboxIRTest.cpp:1871: Failure
Expected equality of these values:
  I0->getOpcodeName()
    Which is: 0x7f7721798a63
  "Add"
    Which is: 0x5416cc

/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/unittests/SandboxIR/SandboxIRTest.cpp:1872: Failure
Expected equality of these values:
  I1->getOpcodeName()
    Which is: 0x7f7721798a6c
  "Sub"
    Which is: 0x5426ba

/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/unittests/SandboxIR/SandboxIRTest.cpp:1873: Failure
Expected equality of these values:
  Ret->getOpcodeName()
    Which is: 0x7f7721798a0c
  "Ret"
    Which is: 0x54134f

/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/unittests/SandboxIR/SandboxIRTest.cpp:1877: Failure
Expected equality of these values:
  sandboxir::Instruction::getOpcodeName( sandboxir::Instruction::Opcode::Alloca)
    Which is: 0x7f7721798acd
  "Alloca"
    Which is: 0x542731


/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/unittests/SandboxIR/SandboxIRTest.cpp:1871
Expected equality of these values:
  I0->getOpcodeName()
    Which is: 0x7f7721798a63
  "Add"
    Which is: 0x5416cc

/b/1/llvm-x86_64-debian-dylib/llvm-project/llvm/unittests/SandboxIR/SandboxIRTest.cpp:1872
Expected equality of these values:
  I1->getOpcodeName()
...

```

</details>

https://github.com/llvm/llvm-project/pull/110050