[lldb][AArch64] Use "+all" feature for the disassembler

[DavidSpickett]

Summary

The "+all" feature name was added in https://reviews.llvm.org/D128029.

This feature means we don't have to generate a list of features
or use a base architecture feature.

[labath]

Awesome. thanks.

lldb/source/Plugins/Disassembler/LLVMC/DisassemblerLLVMC.cpp

if (arch.IsMIPS()) {
     if (arch_flags & ArchSpec::eMIPSAse_dsp)
       features_str += "+dsp,";
     if (arch_flags & ArchSpec::eMIPSAse_dspr2)
       features_str += "+dspr2,";
   }
 
   // If any AArch64 variant, enable latest ISA with all extensions.
   if (triple.isAArch64()) {
-    features_str += "+v9.3a,";
-    std::vector<llvm::StringRef> features;
-    // Get all possible features
-    llvm::AArch64::getExtensionFeatures(-1, features);
-    features_str += llvm::join(features, ",");
+    features_str += "+all,";
 
     if (triple.getVendor() == llvm::Triple::Apple)
       cpu = "apple-latest";
   }
 
   if (triple.isRISCV()) {
     uint32_t arch_flags = arch.GetFlags();
     if (arch_flags & ArchSpec::eRISCV_rvc)

lldb/test/Shell/Commands/command-disassemble-aarch64-extensions.s

 # REQUIRES: aarch64
 
 # This checks that lldb's disassembler enables every extension that an AArch64
 # target could have.
 
-# RUN: llvm-mc -filetype=obj -triple aarch64-linux-gnueabihf %s -o %t \
-# RUN: --mattr=+tme,+mte,+crc,+lse,+rdm,+sm4,+sha3,+aes,+dotprod,+fullfp16 \
-# RUN: --mattr=+fp16fml,+sve,+sve2,+sve2-aes,+sve2-sm4,+sve2-sha3,+sve2-bitperm \
-# RUN: --mattr=+spe,+rcpc,+ssbs,+sb,+predres,+bf16,+mops,+hbc,+sme,+sme-i64 \
-# RUN: --mattr=+sme-f64,+flagm,+pauth,+brbe,+ls64,+f64mm,+f32mm,+i8mm,+rand
+# RUN: llvm-mc -filetype=obj -triple aarch64-linux-gnueabihf %s -o %t --mattr=+all
 # RUN: %lldb %t -o "disassemble -n fn" -o exit 2>&1 | FileCheck %s
 
 .globl  fn
 .type   fn, @function
 fn:
   // These are in the same order as llvm/include/llvm/Support/AArch64TargetParser.def
   crc32b w0, w0, w0                   // CRC
   ldaddab w0, w0, [sp]                // LSE