[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-solaris11-sparcv9` running on `solaris11-sparcv9` while building `llvm` at step 5 "ninja check 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/13/builds/6632

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

```
Step 5 (ninja check 1) failure: stage 1 checked (failure)
******************** TEST 'LLVM :: TableGen/FixedLenDecoderEmitter/conflict.td' FAILED ********************
Exit Code: 134

Command Output (stderr):
--
/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/llvm-tblgen -gen-disassembler -I /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/../../../include /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/conflict.td -o - 2>/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/test/TableGen/FixedLenDecoderEmitter/Output/conflict.td.tmp # RUN: at line 1
+ /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/llvm-tblgen -gen-disassembler -I /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/../../../include /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/conflict.td -o -
/opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/test/TableGen/FixedLenDecoderEmitter/Output/conflict.td.script: line 2: 15132 Abort                   (core dumped) /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/bin/llvm-tblgen -gen-disassembler -I /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/../../../include /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/llvm/llvm/test/TableGen/FixedLenDecoderEmitter/conflict.td -o - 2> /opt/llvm-buildbot/home/solaris11-sparcv9/clang-solaris11-sparcv9/stage1/test/TableGen/FixedLenDecoderEmitter/Output/conflict.td.tmp

--

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


```

</details>

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