[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 `clang-cmake-x86_64-avx512-linux` running on `avx512-intel64` while building `llvm` at step 7 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/133/builds/14636

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

```
Step 7 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: TableGen/FixedLenDecoderEmitter/conflict.td' FAILED ********************
Exit Code: 134

Command Output (stderr):
--
/localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/llvm-tblgen -gen-disassembler -I /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/../../../include /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/conflict.td -o - 2>/localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/test/TableGen/FixedLenDecoderEmitter/Output/conflict.td.tmp # RUN: at line 1
+ /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/llvm-tblgen -gen-disassembler -I /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/../../../include /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/conflict.td -o -
/localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/test/TableGen/FixedLenDecoderEmitter/Output/conflict.td.script: line 2: 1356640 Aborted                 (core dumped) /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/bin/llvm-tblgen -gen-disassembler -I /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/../../../include /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/conflict.td -o - 2> /localdisk2/buildbot/llvm-worker/clang-cmake-x86_64-avx512-linux/stage1/test/TableGen/FixedLenDecoderEmitter/Output/conflict.td.tmp

--

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


```

</details>

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