DBC: Fail cleanly when attempting to create an AOT or JIT app snapshot.

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index 66894b59bb516d37e98910bf3142f944943142b6..9f0e4509adb96570b12474d6343136e4384e9930 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -6236,6 +6236,8 @@ DART_EXPORT Dart_Handle Dart_Precompile(
     bool reset_fields) {
 #if defined(TARGET_ARCH_IA32)
   return Api::NewError("Precompilation is not supported on IA32.");
+#elif defined(TARGET_ARCH_DBC)
+  return Api::NewError("Precompilation is not supported on DBC.");
 #else
   API_TIMELINE_BEGIN_END;
   DARTSCOPE(Thread::Current());
@@ -6265,7 +6267,9 @@ DART_EXPORT Dart_Handle Dart_CreatePrecompiledSnapshotAssembly(
     uint8_t** assembly_buffer,
     intptr_t* assembly_size) {
 #if defined(TARGET_ARCH_IA32)
-  return Api::NewError("Snapshots with code are not supported on IA32.");
+  return Api::NewError("Precompilation is not supported on IA32.");
+#elif defined(TARGET_ARCH_DBC)
+  return Api::NewError("Precompilation is not supported on DBC.");
 #else
   API_TIMELINE_DURATION;
   DARTSCOPE(Thread::Current());
@@ -6325,7 +6329,9 @@ DART_EXPORT Dart_Handle Dart_CreatePrecompiledSnapshotBlob(
     uint8_t** rodata_blob_buffer,
     intptr_t* rodata_blob_size) {
 #if defined(TARGET_ARCH_IA32)
-  return Api::NewError("Snapshots with code are not supported on IA32.");
+  return Api::NewError("Precompilation is not supported on IA32.");
+#elif defined(TARGET_ARCH_DBC)
+  return Api::NewError("Precompilation is not supported on DBC.");
 #else
   API_TIMELINE_DURATION;
   DARTSCOPE(Thread::Current());
@@ -6427,6 +6433,8 @@ DART_EXPORT Dart_Handle Dart_CreateAppJITSnapshot(
     intptr_t* rodata_blob_size) {
 #if defined(TARGET_ARCH_IA32)
   return Api::NewError("Snapshots with code are not supported on IA32.");
+#elif defined(TARGET_ARCH_DBC)
+  return Api::NewError("Snapshots with code are not supported on DBC.");
 #else
   API_TIMELINE_DURATION;
   DARTSCOPE(Thread::Current());