[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-sve-vla` running on `linaro-g3-01` while building `llvm` at step 6 "build stage 1".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/17/builds/7346

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

```
Step 6 (build stage 1) failure: 'ninja' (failure)
...
[3347/8933] Building CXX object lib/ExecutionEngine/JITLink/CMakeFiles/LLVMJITLink.dir/ELF_riscv.cpp.o
[3348/8933] Building CXX object lib/ExecutionEngine/JITLink/CMakeFiles/LLVMJITLink.dir/ELF_ppc64.cpp.o
[3349/8933] Building CXX object lib/ExecutionEngine/JITLink/CMakeFiles/LLVMJITLink.dir/ELF_x86_64.cpp.o
[3350/8933] Building CXX object lib/ExecutionEngine/JITLink/CMakeFiles/LLVMJITLink.dir/COFFDirectiveParser.cpp.o
[3351/8933] Building CXX object lib/ExecutionEngine/JITLink/CMakeFiles/LLVMJITLink.dir/COFFLinkGraphBuilder.cpp.o
[3352/8933] Building CXX object lib/ExecutionEngine/JITLink/CMakeFiles/LLVMJITLink.dir/COFF.cpp.o
[3353/8933] Building CXX object lib/ExecutionEngine/JITLink/CMakeFiles/LLVMJITLink.dir/COFF_x86_64.cpp.o
[3354/8933] Building CXX object lib/ExecutionEngine/JITLink/CMakeFiles/LLVMJITLink.dir/XCOFF.cpp.o
[3355/8933] Building AArch64GenMCCodeEmitter.inc...
[3356/8933] Building AArch64GenDisassemblerTables.inc...
FAILED: lib/Target/AArch64/AArch64GenDisassemblerTables.inc /home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/lib/Target/AArch64/AArch64GenDisassemblerTables.inc 
cd /home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1 && /home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/bin/llvm-tblgen -gen-disassembler --num-to-skip-size=3 -I /home/tcwg-buildbot/worker/clang-aarch64-sve-vla/llvm/llvm/lib/Target/AArch64 -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/llvm/llvm/include -I /home/tcwg-buildbot/worker/clang-aarch64-sve-vla/llvm/llvm/lib/Target /home/tcwg-buildbot/worker/clang-aarch64-sve-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-sve-vla/stage1/bin/llvm-tblgen -gen-disassembler --num-to-skip-size=3 -I /home/tcwg-buildbot/worker/clang-aarch64-sve-vla/llvm/llvm/lib/Target/AArch64 -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/include -I/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/llvm/llvm/include -I /home/tcwg-buildbot/worker/clang-aarch64-sve-vla/llvm/llvm/lib/Target /home/tcwg-buildbot/worker/clang-aarch64-sve-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 0x0000ca116526a060 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/bin/llvm-tblgen+0x44a060)
 #1 0x0000ca11652680ec llvm::sys::RunSignalHandlers() (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/bin/llvm-tblgen+0x4480ec)
 #2 0x0000ca116526a6dc SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #3 0x0000e74e986f48f8 (linux-vdso.so.1+0x8f8)
 #4 0x0000e74e980cf1f0 __pthread_kill_implementation ./nptl/./nptl/pthread_kill.c:44:76
 #5 0x0000e74e9808a67c gsignal ./signal/../sysdeps/posix/raise.c:27:6
 #6 0x0000e74e98077130 abort ./stdlib/./stdlib/abort.c:81:7
 #7 0x0000e74e98083fd4 __assert_fail_base ./assert/./assert/assert.c:91:7
 #8 0x0000e74e9808404c (/lib/aarch64-linux-gnu/libc.so.6+0x3404c)
 #9 0x0000ca11650f7d18 (anonymous namespace)::FilterChooser::emitTableEntries((anonymous namespace)::DecoderTableInfo&) const DecoderEmitter.cpp:0:0
#10 0x0000ca11650f7b84 (anonymous namespace)::FilterChooser::emitTableEntries((anonymous namespace)::DecoderTableInfo&) const DecoderEmitter.cpp:0:0
#11 0x0000ca11650f3e20 (anonymous namespace)::DecoderEmitter::run(llvm::raw_ostream&) DecoderEmitter.cpp:0:0
#12 0x0000ca11650ef960 llvm::EmitDecoder(llvm::RecordKeeper const&, llvm::raw_ostream&, llvm::StringRef) (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/bin/llvm-tblgen+0x2cf960)
#13 0x0000ca116510f338 emitDisassembler(llvm::RecordKeeper const&, llvm::raw_ostream&) DisassemblerEmitter.cpp:0:0
#14 0x0000ca1165297d84 llvm::TableGen::Emitter::ApplyCallback(llvm::RecordKeeper const&, llvm::raw_ostream&) (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/bin/llvm-tblgen+0x477d84)
#15 0x0000ca1165271dd4 llvm::TableGenMain(char const*, std::function<bool (llvm::raw_ostream&, llvm::RecordKeeper const&)>) (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/bin/llvm-tblgen+0x451dd4)
#16 0x0000ca1164f80518 tblgen_main(int, char**) (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/bin/llvm-tblgen+0x160518)
#17 0x0000e74e980773fc __libc_start_call_main ./csu/../sysdeps/nptl/libc_start_call_main.h:74:3
#18 0x0000e74e980774cc call_init ./csu/../csu/libc-start.c:128:20
#19 0x0000e74e980774cc __libc_start_main ./csu/../csu/libc-start.c:379:5
#20 0x0000ca1164f4c3f0 _start (/home/tcwg-buildbot/worker/clang-aarch64-sve-vla/stage1/bin/llvm-tblgen+0x12c3f0)
Aborted
[3357/8933] Building AArch64GenAsmMatcher.inc...
[3358/8933] Building AArch64GenRegisterBank.inc...
[3359/8933] Building AArch64GenSystemOperands.inc...
[3360/8933] Building AArch64GenAsmWriter.inc...
[3361/8933] Building AArch64GenFastISel.inc...
[3362/8933] Building AArch64GenRegisterInfo.inc...
[3363/8933] Building CXX object lib/Object/CMakeFiles/LLVMObject.dir/IRSymtab.cpp.o
[3364/8933] Building AArch64GenGlobalISel.inc...
[3365/8933] Building AArch64GenDAGISel.inc...
[3366/8933] Building AArch64GenSubtargetInfo.inc...
[3367/8933] Building AArch64GenInstrInfo.inc...

```

</details>

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