Rename Target.writeOutline() into computeOutline(), add separate KernelTarget.writeOutline().

pkg/compiler/lib/src/kernel/fasta_support.dart

Index: pkg/compiler/lib/src/kernel/fasta_support.dart
diff --git a/pkg/compiler/lib/src/kernel/fasta_support.dart b/pkg/compiler/lib/src/kernel/fasta_support.dart
index 2f09c85bfd159a1a6bb7911492cf36d8ee4256d2..672b34562c7f9fdff7b57b85e2e88fb0b31d0b62 100644
--- a/pkg/compiler/lib/src/kernel/fasta_support.dart
+++ b/pkg/compiler/lib/src/kernel/fasta_support.dart
@@ -45,7 +45,8 @@ Future compilePlatform(Uri patchedSdk, Uri fullOutput,
       new KernelTargetForDart2js(dillTarget, uriTranslator, false);
 
   kernelTarget.read(Uri.parse("dart:core"));
-  await dillTarget.writeOutline(null);
+  await dillTarget.computeOutline();
+  await kernelTarget.computeOutline();
   await kernelTarget.writeOutline(outlineOutput);
 
   if (exitCode != 0) return null;