[llvm] [AMDGPU][SIMemoryLegalizer][GFX12] Correctly insert sample/bvhcnt (PR #161637)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

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

Full details are available at: https://lab.llvm.org/buildbot/#/builders/129/builds/31774

<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 5 (build-check-mlir-build-only) failure: build (failure) (timed out)
...
685.096 [59/241/4128] Linking CXX static library lib/libMLIRTestFromLLVMIRTranslation.a
685.116 [59/240/4129] Linking CXX static library lib/libMLIRTestTransforms.a
685.160 [59/239/4130] Linking CXX static library lib/libMLIRTestIR.a
685.244 [59/238/4131] Linking CXX static library lib/libMLIRTestPDLL.a
685.383 [59/237/4132] Linking CXX static library lib/libMLIRGPUToSPIRV.a
686.391 [59/236/4133] Linking CXX executable tools/mlir/unittests/Dialect/ArmSME/MLIRArmSMETests
688.145 [59/235/4134] Linking CXX executable tools/mlir/unittests/IR/MLIRIRTests
688.601 [59/234/4135] Linking CXX executable tools/mlir/unittests/TableGen/MLIRTableGenTests
689.305 [59/233/4136] Linking CXX executable tools/mlir/unittests/Parser/MLIRParserTests
708.794 [59/232/4137] Building CXX object tools/mlir/tools/mlir-opt/CMakeFiles/mlir-opt.dir/mlir-opt.cpp.o
command timed out: 1200 seconds without output running [b'ninja', b'check-mlir-build-only'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1910.441663

```

</details>

https://github.com/llvm/llvm-project/pull/161637