Remove functions white-listed for use of try-finally and switch, add JS_SET_CURRENT_ISOLATE.

pkg/compiler/lib/src/js_backend/codegen/task.dart

Index: pkg/compiler/lib/src/js_backend/codegen/task.dart
diff --git a/pkg/compiler/lib/src/js_backend/codegen/task.dart b/pkg/compiler/lib/src/js_backend/codegen/task.dart
index 9c4658c21b4d5f002cab4b55fe401b9a07a8145b..6e861d86e9f8158a0db6cc530d0229be160fb64a 100644
--- a/pkg/compiler/lib/src/js_backend/codegen/task.dart
+++ b/pkg/compiler/lib/src/js_backend/codegen/task.dart
@@ -72,19 +72,7 @@ class CpsFunctionCompiler implements FunctionCompiler {
         // switch.
         if (element.isNative ||
             element.isPatched ||
-            libraryName == 'origin library(dart:typed_data)' ||
-            // Using switch or try-finally.
-            library.isInternalLibrary && name == 'unwrapException' ||
-            library.isPlatformLibrary && className == 'IterableBase' ||
-            library.isInternalLibrary && className == 'Closure' ||
-            libraryName == 'origin library(dart:collection)' &&
-               name == 'mapToString' ||
-            libraryName == 'library(dart:html)' && name == 'sanitizeNode' ||
-            className == '_IsolateContext' ||
-            className == 'IsolateNatives' ||
-            className == '_Deserializer' ||
-            name == '_rootRun' ||
-            name == '_microtaskLoopEntry') {
+            libraryName == 'origin library(dart:typed_data)') {
           compiler.log('Using SSA compiler for platform element $element');
           return fallbackCompiler.compile(work);
         }