Revert "Clean up the patch file for the isolate library by introducing a new builtin library: isola…

sdk/lib/_internal/compiler/implementation/ssa/builder.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/builder.dart
diff --git a/sdk/lib/_internal/compiler/implementation/ssa/builder.dart b/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
index 277be1e64bbff78bb51e8cc6782a6cef8886a738..c174f0da37d8ee940cda5d2225eabd69b4398e64 100644
--- a/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
+++ b/sdk/lib/_internal/compiler/implementation/ssa/builder.dart
@@ -3045,7 +3045,7 @@ class SsaBuilder extends ResolvedVisitor implements Visitor {
       // Call a helper method from the isolate library. The isolate
       // library uses its own isolate structure, that encapsulates
       // Leg's isolate.
-      Element element = compiler.isolateHelperLibrary.find(
+      Element element = compiler.isolateLibrary.find(
           const SourceString('_currentIsolate'));
       if (element == null) {
         compiler.cancel(
@@ -3065,7 +3065,7 @@ class SsaBuilder extends ResolvedVisitor implements Visitor {
       push(new HInvokeClosure(selector, <HInstruction>[pop()]));
     } else {
       // Call a helper method from the isolate library.
-      Element element = compiler.isolateHelperLibrary.find(
+      Element element = compiler.isolateLibrary.find(
           const SourceString('_callInIsolate'));
       if (element == null) {
         compiler.cancel(