[lldb-dap] show function name in the instruction comment. (#144070)

putting the function name is the dissassembly instruction messes up the
alignment making it less readable. put it instead with the comment.

This also aligns the opcodes and instruction to the left matching the
cli

Author: da-viper

lldb/tools/lldb-dap/Handler/DisassembleRequestHandler.cpp

@@ -100,7 +100,7 @@ static DisassembledInstruction ConvertSBInstructionToDisassembledInstruction(
 
   const char *m = inst.GetMnemonic(target);
   const char *o = inst.GetOperands(target);
-  const char *c = inst.GetComment(target);
+  std::string c = inst.GetComment(target);
   auto d = inst.GetData(target);
 
   std::string bytes;
@@ -114,34 +114,30 @@ static DisassembledInstruction ConvertSBInstructionToDisassembledInstruction(
 
   DisassembledInstruction disassembled_inst;
   disassembled_inst.address = inst_addr;
-  disassembled_inst.instructionBytes =
-      bytes.size() > 0 ? bytes.substr(0, bytes.size() - 1) : "";
 
-  std::string instruction;
-  llvm::raw_string_ostream si(instruction);
+  if (!bytes.empty()) // remove last whitespace
+    bytes.pop_back();
+  disassembled_inst.instructionBytes = std::move(bytes);
+
+  llvm::raw_string_ostream si(disassembled_inst.instruction);
+  si << llvm::formatv("{0,-7} {1,-25}", m, o);
 
-  lldb::SBSymbol symbol = addr.GetSymbol();
   // Only add the symbol on the first line of the function.
-  if (symbol.IsValid() && symbol.GetStartAddress() == addr) {
-    // If we have a valid symbol, append it as a label prefix for the first
-    // instruction. This is so you can see the start of a function/callsite
-    // in the assembly, at the moment VS Code (1.80) does not visualize the
-    // symbol associated with the assembly instruction.
-    si << (symbol.GetMangledName() != nullptr ? symbol.GetMangledName()
-                                              : symbol.GetName())
-       << ": ";
+  // in the comment section
+  if (lldb::SBSymbol symbol = addr.GetSymbol();
+      symbol.GetStartAddress() == addr) {
+    const llvm::StringRef sym_display_name = symbol.GetDisplayName();
+    c.append(" ");
+    c.append(sym_display_name);
 
     if (resolve_symbols)
-      disassembled_inst.symbol = symbol.GetDisplayName();
+      disassembled_inst.symbol = sym_display_name;
   }
 
-  si << llvm::formatv("{0,7} {1,12}", m, o);
-  if (c && c[0]) {
+  if (!c.empty()) {
     si << " ; " << c;
   }
 
-  disassembled_inst.instruction = std::move(instruction);
-
   protocol::Source source = CreateSource(addr, target);
   lldb::SBLineEntry line_entry = GetLineEntryForAddress(target, addr);