[clang] [llvm] [Hexagon] Add V81 support to compiler and assembler (PR #164922)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `arc-builder` running on `arc-worker` while building `clang,llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/3/builds/23933

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

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/X86/sse2-intrinsics-fast-isel.ll' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 2
/buildbot/worker/arc-folder/build/bin/llc < /buildbot/worker/arc-folder/llvm-project/llvm/test/CodeGen/X86/sse2-intrinsics-fast-isel.ll -show-mc-encoding -fast-isel -mtriple=i386-unknown-unknown -mattr=+sse2 | /buildbot/worker/arc-folder/build/bin/FileCheck /buildbot/worker/arc-folder/llvm-project/llvm/test/CodeGen/X86/sse2-intrinsics-fast-isel.ll --check-prefixes=CHECK,X86,SSE,X86-SSE
# executed command: /buildbot/worker/arc-folder/build/bin/llc -show-mc-encoding -fast-isel -mtriple=i386-unknown-unknown -mattr=+sse2
# .---command stderr------------
# | LLVM ERROR: Cannot select: intrinsic %llvm.x86.sse2.clflush
# | PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace and instructions to reproduce the bug.
# | Stack dump:
# | 0.	Program arguments: /buildbot/worker/arc-folder/build/bin/llc -show-mc-encoding -fast-isel -mtriple=i386-unknown-unknown -mattr=+sse2
# | 1.	Running pass 'Function Pass Manager' on module '<stdin>'.
# | 2.	Running pass 'X86 DAG->DAG Instruction Selection' on function '@test_mm_clflush'
# |  #0 0x000000000239c2f8 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/buildbot/worker/arc-folder/build/bin/llc+0x239c2f8)
# |  #1 0x0000000002399205 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
# |  #2 0x00007f2b2b088630 __restore_rt sigaction.c:0:0
# |  #3 0x00007f2b29dd83d7 raise (/usr/lib64/libc.so.6+0x363d7)
# |  #4 0x00007f2b29dd9ac8 abort (/usr/lib64/libc.so.6+0x37ac8)
# |  #5 0x000000000072913f llvm::json::operator==(llvm::json::Value const&, llvm::json::Value const&) (.cold) JSON.cpp:0:0
# |  #6 0x000000000211cde9 llvm::SelectionDAGISel::CannotYetSelect(llvm::SDNode*) (/buildbot/worker/arc-folder/build/bin/llc+0x211cde9)
# |  #7 0x000000000212195a llvm::SelectionDAGISel::SelectCodeCommon(llvm::SDNode*, unsigned char const*, unsigned int) (/buildbot/worker/arc-folder/build/bin/llc+0x212195a)
# |  #8 0x000000000096f7f7 (anonymous namespace)::X86DAGToDAGISel::Select(llvm::SDNode*) X86ISelDAGToDAG.cpp:0:0
# |  #9 0x000000000211862f llvm::SelectionDAGISel::DoInstructionSelection() (/buildbot/worker/arc-folder/build/bin/llc+0x211862f)
# | #10 0x0000000002128508 llvm::SelectionDAGISel::CodeGenAndEmitDAG() (/buildbot/worker/arc-folder/build/bin/llc+0x2128508)
# | #11 0x000000000212c7b3 llvm::SelectionDAGISel::SelectAllBasicBlocks(llvm::Function const&) (/buildbot/worker/arc-folder/build/bin/llc+0x212c7b3)
# | #12 0x000000000212d2a5 llvm::SelectionDAGISel::runOnMachineFunction(llvm::MachineFunction&) (/buildbot/worker/arc-folder/build/bin/llc+0x212d2a5)
# | #13 0x0000000002117e3f llvm::SelectionDAGISelLegacy::runOnMachineFunction(llvm::MachineFunction&) (/buildbot/worker/arc-folder/build/bin/llc+0x2117e3f)
# | #14 0x00000000012267e7 llvm::MachineFunctionPass::runOnFunction(llvm::Function&) (.part.0) MachineFunctionPass.cpp:0:0
# | #15 0x00000000018a54bb llvm::FPPassManager::runOnFunction(llvm::Function&) (/buildbot/worker/arc-folder/build/bin/llc+0x18a54bb)
# | #16 0x00000000018a5861 llvm::FPPassManager::runOnModule(llvm::Module&) (/buildbot/worker/arc-folder/build/bin/llc+0x18a5861)
# | #17 0x00000000018a6475 llvm::legacy::PassManagerImpl::run(llvm::Module&) (/buildbot/worker/arc-folder/build/bin/llc+0x18a6475)
# | #18 0x000000000080d938 compileModule(char**, llvm::LLVMContext&) llc.cpp:0:0
# | #19 0x0000000000731ab6 main (/buildbot/worker/arc-folder/build/bin/llc+0x731ab6)
# | #20 0x00007f2b29dc4555 __libc_start_main (/usr/lib64/libc.so.6+0x22555)
# | #21 0x0000000000802b76 _start (/buildbot/worker/arc-folder/build/bin/llc+0x802b76)
# `-----------------------------
# error: command failed with exit status: -6
# executed command: /buildbot/worker/arc-folder/build/bin/FileCheck /buildbot/worker/arc-folder/llvm-project/llvm/test/CodeGen/X86/sse2-intrinsics-fast-isel.ll --check-prefixes=CHECK,X86,SSE,X86-SSE
# .---command stderr------------
# | /buildbot/worker/arc-folder/llvm-project/llvm/test/CodeGen/X86/sse2-intrinsics-fast-isel.ll:399:14: error: SSE-LABEL: expected string not found in input
# | ; SSE-LABEL: test_mm_bsrli_si128:
# |              ^
# | <stdin>:170:21: note: scanning from here
# | test_mm_bslli_si128: # @test_mm_bslli_si128
# |                     ^
# | <stdin>:178:9: note: possible intended match here
# |  .globl test_mm_bsrli_si128 # 
# |         ^
...

```

</details>

https://github.com/llvm/llvm-project/pull/164922