[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 `ppc64-flang-aix` running on `ppc64-flang-aix-test` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/201/builds/4163

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

```
Step 5 (build-unified-tree) failure: build (failure)
...
5146.815 [3799/10/4303] Linking CXX static library lib/libFortranSupport.a
5147.028 [3798/10/4304] Linking CXX static library lib/libFIRDialectSupport.a
5147.830 [3797/10/4305] Building CXX object tools/flang/lib/Optimizer/Dialect/CMakeFiles/FIRDialect.dir/FirAliasTagOpInterface.cpp.o
5148.469 [3796/10/4306] Building CXX object tools/flang/lib/Optimizer/Dialect/CMakeFiles/FIRDialect.dir/Inliner.cpp.o
5149.827 [3795/10/4307] Building CXX object tools/flang/lib/Optimizer/Dialect/CMakeFiles/FIRDialect.dir/SafeTempArrayCopyAttrInterface.cpp.o
5150.867 [3794/10/4308] Building AArch64GenAsmWriter.inc...
5150.978 [3793/10/4309] Building AArch64GenAsmMatcher.inc...
5151.583 [3792/10/4310] Building AArch64GenAsmWriter1.inc...
5152.183 [3791/10/4311] Building AArch64GenCallingConv.inc...
5154.628 [3790/10/4312] Building AArch64GenDisassemblerTables.inc...
FAILED: lib/Target/AArch64/AArch64GenDisassemblerTables.inc /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/lib/Target/AArch64/AArch64GenDisassemblerTables.inc 
cd /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build && /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/llvm-tblgen -gen-disassembler --num-to-skip-size=3 -I /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/llvm/lib/Target/AArch64 -I/home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/include -I/home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/llvm/include -I /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/llvm/lib/Target /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/llvm/lib/Target/AArch64/AArch64.td --write-if-changed -o lib/Target/AArch64/AArch64GenDisassemblerTables.inc -d lib/Target/AArch64/AArch64GenDisassemblerTables.inc.d
Assertion failed: DestIdx > FixupIdx + NumToSkipSizeInBytes && "Expecting a forward jump in the decoding table", file  /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/llvm/utils/TableGen/DecoderEmitter.cpp, line 151, void (anonymous namespace)::DecoderTable::patchNumToSkip(size_t, uint32_t)()
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/bin/llvm-tblgen -gen-disassembler --num-to-skip-size=3 -I /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/llvm/lib/Target/AArch64 -I/home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/build/include -I/home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/llvm/include -I /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/llvm/lib/Target /home/llvm/llvm-external-buildbots/workers/ppc64-flang-aix-test/ppc64-flang-aix-build/llvm-project/llvm/lib/Target/AArch64/AArch64.td --write-if-changed -o lib/Target/AArch64/AArch64GenDisassemblerTables.inc -d lib/Target/AArch64/AArch64GenDisassemblerTables.inc.d
5154.628 [3790/9/4313] Building AArch64GenExegesis.inc...
5156.970 [3790/8/4314] Building AArch64GenFastISel.inc...
5158.786 [3790/7/4315] Building AArch64GenDAGISel.inc...
5159.979 [3790/6/4316] Building CXX object tools/flang/lib/Optimizer/Dialect/CMakeFiles/FIRDialect.dir/FIRDialect.cpp.o
5180.280 [3790/5/4317] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/program-parsers.cpp.o
5184.190 [3790/4/4318] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/Fortran-parsers.cpp.o
5191.537 [3790/3/4319] Building CXX object tools/flang/lib/Optimizer/Dialect/CMakeFiles/FIRDialect.dir/FIROps.cpp.o
5229.189 [3790/2/4320] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/unparse.cpp.o
5272.892 [3790/1/4321] Building CXX object tools/flang/lib/Parser/CMakeFiles/FortranParser.dir/openmp-parsers.cpp.o
ninja: build stopped: subcommand failed.

```

</details>

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