Cleanup 1: split parts into their own libraries, remove unused imports

pkg/compiler/lib/src/ssa/ssa.dart

Index: pkg/compiler/lib/src/ssa/ssa.dart
diff --git a/pkg/compiler/lib/src/ssa/ssa.dart b/pkg/compiler/lib/src/ssa/ssa.dart
index 5139e5e0a76c4480e7b139198f84f54510499110..555b82c14273844fc64d69659e08fe286faaaac7 100644
--- a/pkg/compiler/lib/src/ssa/ssa.dart
+++ b/pkg/compiler/lib/src/ssa/ssa.dart
@@ -4,80 +4,4 @@
 
 library ssa;
 
-import 'dart:collection';
-
-import 'package:js_runtime/shared/embedded_names.dart';
-
-import '../closure.dart';
-import '../common.dart';
-import '../common/codegen.dart' show
-    CodegenRegistry,
-    CodegenWorkItem;
-import '../common/names.dart' show
-    Identifiers,
-    Selectors;
-import '../common/tasks.dart' show
-    CompilerTask;
-import '../compiler.dart' show
-    Compiler;
-import '../constant_system_dart.dart';
-import '../constants/constant_system.dart';
-import '../constants/expressions.dart';
-import '../constants/values.dart';
-import '../core_types.dart' show
-    CoreClasses;
-import '../dart_types.dart';
-import '../diagnostics/messages.dart' show
-    Message,
-    MessageTemplate;
-import '../elements/elements.dart';
-import '../elements/modelx.dart' show
-    ConstructorBodyElementX,
-    ElementX,
-    VariableElementX;
-import '../io/source_information.dart';
-import '../js/js.dart' as js;
-import '../js_backend/backend_helpers.dart' show
-    BackendHelpers;
-import '../js_backend/js_backend.dart';
-import '../js_emitter/js_emitter.dart' show
-    CodeEmitterTask,
-    NativeEmitter;
-import '../native/native.dart' as native;
-import '../resolution/operators.dart';
-import '../resolution/semantic_visitor.dart';
-import '../resolution/tree_elements.dart' show
-    TreeElements;
-import '../tree/tree.dart' as ast;
-import '../types/types.dart';
-import '../types/constants.dart' show
-    computeTypeMask;
-import '../universe/call_structure.dart' show
-    CallStructure;
-import '../universe/selector.dart' show
-    Selector;
-import '../universe/side_effects.dart' show
-    SideEffects;
-import '../universe/use.dart' show
-    DynamicUse,
-    StaticUse,
-    TypeUse;
-import '../util/util.dart';
-import '../world.dart' show
-    ClassWorld,
-    World;
-import '../dump_info.dart' show InfoReporter;
-
-part 'builder.dart';
-part 'codegen.dart';
-part 'codegen_helpers.dart';
-part 'interceptor_simplifier.dart';
-part 'invoke_dynamic_specializers.dart';
-part 'nodes.dart';
-part 'optimize.dart';
-part 'types.dart';
-part 'types_propagation.dart';
-part 'validate.dart';
-part 'variable_allocator.dart';
-part 'value_range_analyzer.dart';
-part 'value_set.dart';
+export 'builder.dart' show SsaFunctionCompiler;