Split World usage into open, inference, and closed world.

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

Index: pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
diff --git a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
index 6c3c8355ebc4c14999b9e2caeb76287d1ea4dae9..deaef9b3668117e3954a2f8ec3783042d5641681 100644
--- a/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
+++ b/pkg/compiler/lib/src/ssa/kernel_ast_adapter.dart
@@ -68,7 +68,7 @@ class KernelAstAdapter {
 
   bool getCanThrow(ir.Procedure procedure) {
     FunctionElement function = getElement(procedure);
-    return !_compiler.world.getCannotThrow(function);
+    return !_compiler.closedWorld.getCannotThrow(function);
   }
 
   TypeMask returnTypeOf(ir.Procedure node) {
@@ -77,7 +77,7 @@ class KernelAstAdapter {
   }
 
   SideEffects getSideEffects(ir.Node node) {
-    return _compiler.world.getSideEffectsOfElement(getElement(node));
+    return _compiler.closedWorld.getSideEffectsOfElement(getElement(node));
   }
 
   // TODO(het): Create the selector directly from the invocation