[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-aarch64-sve2-vla` running on `linaro-g4-02` while building `llvm` at step 6 "build stage 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/198/builds/3742

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

```
Step 6 (build stage 1) failure: 'ninja' (failure)
...
[3552/8933] Building CXX object lib/ExecutionEngine/Orc/Debugging/CMakeFiles/LLVMOrcDebugging.dir/PerfSupportPlugin.cpp.o
[3553/8933] Building CXX object lib/ExecutionEngine/Orc/CMakeFiles/LLVMOrcJIT.dir/UnwindInfoRegistrationPlugin.cpp.o
[3554/8933] Building AArch64GenCallingConv.inc...
[3555/8933] Building AArch64GenExegesis.inc...
[3556/8933] Building AArch64GenMCPseudoLowering.inc...
[3557/8933] Building AArch64GenO0PreLegalizeGICombiner.inc...
[3558/8933] Building AArch64GenPostLegalizeGICombiner.inc...
[3559/8933] Building AArch64GenMCCodeEmitter.inc...
[3560/8933] Building AArch64GenAsmWriter.inc...
[3561/8933] Building AArch64GenDisassemblerTables.inc...
FAILED: lib/Target/AArch64/AArch64GenDisassemblerTables.inc /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/lib/Target/AArch64/AArch64GenDisassemblerTables.inc 
cd /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1 && /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/bin/llvm-tblgen -gen-disassembler --num-to-skip-size=3 -I /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/llvm/lib/Target/AArch64 -I/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/llvm/include -I /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/llvm/lib/Target /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/llvm/lib/Target/AArch64/AArch64.td --write-if-changed -o lib/Target/AArch64/AArch64GenDisassemblerTables.inc -d lib/Target/AArch64/AArch64GenDisassemblerTables.inc.d
llvm-tblgen: ../llvm/llvm/utils/TableGen/DecoderEmitter.cpp:151: void (anonymous namespace)::DecoderTable::patchNumToSkip(size_t, uint32_t): Assertion `DestIdx > FixupIdx + NumToSkipSizeInBytes && "Expecting a forward jump in the decoding table"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.	Program arguments: /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/bin/llvm-tblgen -gen-disassembler --num-to-skip-size=3 -I /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/llvm/lib/Target/AArch64 -I/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/llvm/include -I /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/llvm/lib/Target /home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/llvm/llvm/lib/Target/AArch64/AArch64.td --write-if-changed -o lib/Target/AArch64/AArch64GenDisassemblerTables.inc -d lib/Target/AArch64/AArch64GenDisassemblerTables.inc.d
 #0 0x0000b68d6e439cc0 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/bin/llvm-tblgen+0x459cc0)
 #1 0x0000b68d6e437cec llvm::sys::RunSignalHandlers() (/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/bin/llvm-tblgen+0x457cec)
 #2 0x0000b68d6e43a35c SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #3 0x0000feb01efc58f8 (linux-vdso.so.1+0x8f8)
 #4 0x0000feb01eacf1f0 __pthread_kill_implementation ./nptl/./nptl/pthread_kill.c:44:76
 #5 0x0000feb01ea8a67c gsignal ./signal/../sysdeps/posix/raise.c:27:6
 #6 0x0000feb01ea77130 abort ./stdlib/./stdlib/abort.c:81:7
 #7 0x0000feb01ea83fd4 __assert_fail_base ./assert/./assert/assert.c:91:7
 #8 0x0000feb01ea8404c (/lib/aarch64-linux-gnu/libc.so.6+0x3404c)
 #9 0x0000b68d6e2c1034 (anonymous namespace)::FilterChooser::emitTableEntries((anonymous namespace)::DecoderTableInfo&) const DecoderEmitter.cpp:0:0
#10 0x0000b68d6e2c0e98 (anonymous namespace)::FilterChooser::emitTableEntries((anonymous namespace)::DecoderTableInfo&) const DecoderEmitter.cpp:0:0
#11 0x0000b68d6e2bcf94 (anonymous namespace)::DecoderEmitter::run(llvm::raw_ostream&) DecoderEmitter.cpp:0:0
#12 0x0000b68d6e2b8940 llvm::EmitDecoder(llvm::RecordKeeper const&, llvm::raw_ostream&, llvm::StringRef) (/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/bin/llvm-tblgen+0x2d8940)
#13 0x0000b68d6e2d9078 emitDisassembler(llvm::RecordKeeper const&, llvm::raw_ostream&) DisassemblerEmitter.cpp:0:0
#14 0x0000b68d6e4688a4 llvm::TableGen::Emitter::ApplyCallback(llvm::RecordKeeper const&, llvm::raw_ostream&) (/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/bin/llvm-tblgen+0x4888a4)
#15 0x0000b68d6e441d34 llvm::TableGenMain(char const*, std::function<bool (llvm::raw_ostream&, llvm::RecordKeeper const&)>) (/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/bin/llvm-tblgen+0x461d34)
#16 0x0000b68d6e1417a8 tblgen_main(int, char**) (/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/bin/llvm-tblgen+0x1617a8)
#17 0x0000feb01ea773fc __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#18 0x0000feb01ea774cc call_init ./csu/../csu/libc-start.c:128:20
#19 0x0000feb01ea774cc __libc_start_main ./csu/../csu/libc-start.c:379:5
#20 0x0000b68d6e10c430 _start (/home/tcwg-buildbot/worker/clang-aarch64-sve2-vla/stage1/bin/llvm-tblgen+0x12c430)
Aborted
[3562/8933] Building AArch64GenAsmWriter1.inc...
[3563/8933] Building AArch64GenAsmMatcher.inc...
[3564/8933] Building AArch64GenFastISel.inc...
[3565/8933] Building AArch64GenPostLegalizeGILowering.inc...
[3566/8933] Building AArch64GenGlobalISel.inc...
[3567/8933] Building AArch64GenDAGISel.inc...
[3568/8933] Building CXX object lib/CodeGen/AsmPrinter/CMakeFiles/LLVMAsmPrinter.dir/AsmPrinter.cpp.o
[3569/8933] Building CXX object lib/LTO/CMakeFiles/LLVMLTO.dir/LTO.cpp.o
[3570/8933] Building AArch64GenInstrInfo.inc...
ninja: build stopped: subcommand failed.

```

</details>

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