[llvm] [ARM] Add writeback information to STC and LDC instructions. (PR #67180)

[Anton Kochkov via llvm-commits]

================
@@ -1943,6 +1948,10 @@ static DecodeStatus DecodeCopMemInstruction(MCInst &Inst, unsigned Insn,
   if (featureBits[ARM::HasV8Ops] && (coproc != 14))
     return MCDisassembler::Fail;
 
+  if (IsPreIndexed)
+    // Dummy operand for Rn_wb.
+    MCOperand_CreateImm0(Inst, (0));
----------------
XVilka wrote:

```
FAILED: lib/Target/ARM/Disassembler/CMakeFiles/LLVMARMDisassembler.dir/ARMDisassembler.cpp.o
--
  | CCACHE_CPP2=yes CCACHE_HASHDIR=yes /usr/bin/ccache /usr/bin/clang++ -DBUILD_EXAMPLES -DGTEST_HAS_RTTI=0 -D_DEBUG -D_GLIBCXX_ASSERTIONS -D_GNU_SOURCE -D_LIBCPP_ENABLE_HARDENED_MODE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/var/lib/buildkite-agent/builds/linux-56-7f758798dd-z9fgd-1/llvm-project/github-pull-requests/build/lib/Target/ARM/Disassembler -I/var/lib/buildkite-agent/builds/linux-56-7f758798dd-z9fgd-1/llvm-project/github-pull-requests/llvm/lib/Target/ARM/Disassembler -I/var/lib/buildkite-agent/builds/linux-56-7f758798dd-z9fgd-1/llvm-project/github-pull-requests/llvm/lib/Target/ARM -I/var/lib/buildkite-agent/builds/linux-56-7f758798dd-z9fgd-1/llvm-project/github-pull-requests/build/lib/Target/ARM -I/var/lib/buildkite-agent/builds/linux-56-7f758798dd-z9fgd-1/llvm-project/github-pull-requests/build/include -I/var/lib/buildkite-agent/builds/linux-56-7f758798dd-z9fgd-1/llvm-project/github-pull-requests/llvm/include -gmlt -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wmissing-field-initializers -pedantic -Wno-long-long -Wc++98-compat-extra-semi -Wimplicit-fallthrough -Wcovered-switch-default -Wno-noexcept-type -Wnon-virtual-dtor -Wdelete-non-virtual-dtor -Wsuggest-override -Wstring-conversion -Wmisleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG -fvisibility=hidden  -fno-exceptions -funwind-tables -fno-rtti -UNDEBUG -std=c++17 -MD -MT lib/Target/ARM/Disassembler/CMakeFiles/LLVMARMDisassembler.dir/ARMDisassembler.cpp.o -MF lib/Target/ARM/Disassembler/CMakeFiles/LLVMARMDisassembler.dir/ARMDisassembler.cpp.o.d -o lib/Target/ARM/Disassembler/CMakeFiles/LLVMARMDisassembler.dir/ARMDisassembler.cpp.o -c /var/lib/buildkite-agent/builds/linux-56-7f758798dd-z9fgd-1/llvm-project/github-pull-requests/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
  | /var/lib/buildkite-agent/builds/linux-56-7f758798dd-z9fgd-1/llvm-project/github-pull-requests/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp:1953:5: error: use of undeclared identifier 'MCOperand_CreateImm0'
  | MCOperand_CreateImm0(Inst, (0));
  | ^
  | 1 error generated.
```


https://github.com/llvm/llvm-project/pull/67180