testing/dart: upgrade to 2.18.2, build full SDK, add -dev and -sdk subpackages

• AOT snapshot generation broken
• separate dev snapshots from just runtime
• dart compile jit-snapshot runs the code after snapshooting it

while AOT snapshots are still broken, and there is a problem about JIT snapshot generation, kernel snapshots work great

AOT error

Unhandled exception: Crash when compiling null, at character offset null: Bad state: No element #0 _GrowableList.single (dart:core-patch/growable_array.dart:353:22) #1 ClassBuilderImpl.buildAliasedTypeWithBuiltArguments (package:front_end/src/fasta/builder/class_builder.dart:331:44) #2 ClassBuilderImpl.buildAliasedType (package:front_end/src/fasta/builder/class_builder.dart:354:12) #3 NamedTypeBuilder._buildAliasedInternal (package:front_end/src/fasta/builder/named_type_builder.dart:417:25) #4 NamedTypeBuilder.buildAliased (package:front_end/src/fasta/builder/named_type_builder.dart:411:12) #5 FunctionTypeBuilder.buildAliased (package:front_end/src/fasta/builder/function_type_builder.dart:125:20) #6 FunctionTypeBuilder._buildInternal (package:front_end/src/fasta/builder/function_type_builder.dart:115:28) #7 _ExplicitFunctionTypeBuilder.build (package:front_end/src/fasta/builder/function_type_builder.dart:233:22) #8 FormalParameterBuilder.build (package:front_end/src/fasta/builder/formal_parameter_builder.dart:152:34) #9 SourceFunctionBuilderImpl.buildFunction (package:front_end/src/fasta/source/source_function_builder.dart:344:48) #10 SourceFactoryBuilder._build (package:front_end/src/fasta/source/source_factory_builder.dart:144:5) #11 SourceFactoryBuilder.buildOutlineNodes (package:front_end/src/fasta/source/source_factory_builder.dart:136:5) #12 SourceClassBuilder.build.buildBuilders (package:front_end/src/fasta/source/source_class_builder.dart:185:16) #13 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:617:13) #14 ConstructorScope.forEach (package:front_end/src/fasta/scope.dart:604:11) #15 SourceClassBuilder.build (package:front_end/src/fasta/source/source_class_builder.dart:214:22) #16 SourceLibraryBuilder._buildOutlineNodes (package:front_end/src/fasta/source/source_library_builder.dart:3069:31) #17 SourceLibraryBuilder.buildOutlineNodes (package:front_end/src/fasta/source/source_library_builder.dart:1062:7) #18 SourceLoader.buildOutlineNodes (package:front_end/src/fasta/source/source_loader.dart:2025:32) #19 KernelTarget.buildOutlines. (package:front_end/src/fasta/kernel/kernel_target.dart:475:14) #20 withCrashReporting (package:front_end/src/fasta/crash.dart:122:12) #21 _buildInternal (package:front_end/src/kernel_generator_impl.dart:139:7) #22 withCrashReporting (package:front_end/src/fasta/crash.dart:122:12) #23 kernelForProgramInternal. (package:front_end/src/api_prototype/kernel_generator.dart:62:29) #24 kernelForProgramInternal (package:front_end/src/api_prototype/kernel_generator.dart:61:10) #25 kernelForProgram (package:front_end/src/api_prototype/kernel_generator.dart:50:11) #26 compileToKernel (package:vm/kernel_front_end.dart:394:22) #27 runCompiler (package:vm/kernel_front_end.dart:297:19) #28 main (file:///home/lauren/aports/testing/dart/src/dart-sdk-2.18.2/pkg/vm/bin/gen_kernel.dart:34:19)