[vm] Read causal-async-stacks/lazy-async-stacks from snapshot (instea…

…d of requiring AOT runtime to pass same flags as in compiler)

We already do this for "use-bare-instructions" and "dwarf-stack-traces". This
CL does the same for "causal-async-stacks" and "lazy-async-stacks".

Issue #39525

Change-Id: I44136299858b3b72e8a3a176234f5051d6b61c1d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/130364
Reviewed-by: Teagan Strickland <sstrickl@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>

runtime/vm/dart.cc

@@ -843,18 +843,16 @@ const char* Dart::FeaturesString(Isolate* isolate,
     ADD_FLAG(#name, value);                                                    \
   } while (0);
 
-  VM_GLOBAL_FLAG_LIST(ADD_FLAG);
   if (Snapshot::IncludesCode(kind)) {
+    VM_GLOBAL_FLAG_LIST(ADD_FLAG);
+
     // enabling assertions affects deopt ids.
     ADD_ISOLATE_FLAG(asserts, enable_asserts, FLAG_enable_asserts);
     if (kind == Snapshot::kFullJIT) {
       ADD_ISOLATE_FLAG(use_field_guards, use_field_guards,
                        FLAG_use_field_guards);
       ADD_ISOLATE_FLAG(use_osr, use_osr, FLAG_use_osr);
     }
-    buffer.AddString(FLAG_causal_async_stacks ? " causal_async_stacks"
-                                              : " no-causal_async_stacks");
-
 #if !defined(PRODUCT)
     buffer.AddString(FLAG_code_comments ? " code-comments"
                                         : " no-code-comments");
@@ -890,10 +888,6 @@ const char* Dart::FeaturesString(Isolate* isolate,
 #endif
   }
 
-  if (FLAG_precompiled_mode && FLAG_dwarf_stack_traces) {
-    buffer.AddString(" dwarf-stack-traces");
-  }
-
   if (Dart::non_nullable_flag()) {
     buffer.AddString(" nnbd-experiment");
   }

runtime/vm/flag_list.h

@@ -250,6 +250,8 @@ constexpr bool kDartUseBackgroundCompilation = true;
 //   V(name, command-line-flag-name)
 #define VM_GLOBAL_FLAG_LIST(V)                                                 \
   V(dwarf_stack_traces, FLAG_dwarf_stack_traces)                               \
+  V(causal_async_stacks, FLAG_causal_async_stacks)                             \
+  V(lazy_async_stacks, FLAG_lazy_async_stacks)                                 \
   V(use_bare_instructions, FLAG_use_bare_instructions)
 
 #endif  // RUNTIME_VM_FLAG_LIST_H_