[llvm] [LLVM][TableGen] Parameterize NumToSkip in DecoderEmitter (PR #135882)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `openmp-offload-amdgpu-runtime-2` running on `rocm-worker-hw-02` while building `llvm` at step 8 "Add check check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/10/builds/3600

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

```
Step 8 (Add check check-llvm) failure: test (failure)
******************** TEST 'LLVM :: TableGen/FixedLenDecoderEmitter/conflict.td' FAILED ********************
Exit Code: 134

Command Output (stderr):
--
/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/llvm-tblgen -gen-disassembler -I /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/llvm/test/TableGen/FixedLenDecoderEmitter/../../../include /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/llvm/test/TableGen/FixedLenDecoderEmitter/conflict.td -o - 2>/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/test/TableGen/FixedLenDecoderEmitter/Output/conflict.td.tmp # RUN: at line 1
+ /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/llvm-tblgen -gen-disassembler -I /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/llvm/test/TableGen/FixedLenDecoderEmitter/../../../include /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/llvm/test/TableGen/FixedLenDecoderEmitter/conflict.td -o -
/home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/test/TableGen/FixedLenDecoderEmitter/Output/conflict.td.script: line 2: 72196 Aborted                 (core dumped) /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/bin/llvm-tblgen -gen-disassembler -I /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/llvm/test/TableGen/FixedLenDecoderEmitter/../../../include /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.src/llvm/test/TableGen/FixedLenDecoderEmitter/conflict.td -o - 2> /home/botworker/builds/openmp-offload-amdgpu-runtime-2/llvm.build/test/TableGen/FixedLenDecoderEmitter/Output/conflict.td.tmp

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/135882