Move the 'verify' flag to buildProgram().

pkg/front_end/lib/src/fasta/fasta.dart

Index: pkg/front_end/lib/src/fasta/fasta.dart
diff --git a/pkg/front_end/lib/src/fasta/fasta.dart b/pkg/front_end/lib/src/fasta/fasta.dart
index bf5d6ee57d43ad1040b1405983f1e4e24183a02e..8a700879f34a0ccc735d9bc1d74991ad3fef3b0b 100644
--- a/pkg/front_end/lib/src/fasta/fasta.dart
+++ b/pkg/front_end/lib/src/fasta/fasta.dart
@@ -158,9 +158,9 @@ class CompileTask {
     KernelTarget kernelTarget = await buildOutline();
     if (exitCode != 0) return null;
     Uri uri = c.options.output;
-    var program = await kernelTarget.buildProgram();
+    var program = await kernelTarget.buildProgram(verify: c.options.verify);
     if (c.options.dumpIr) printProgramText(program);
-    await kernelTarget.writeProgram(uri, verify: c.options.verify);
+    await kernelTarget.writeProgram(uri);
     return uri;
   }
 }
@@ -200,9 +200,7 @@ Future<CompilationResult> parseScriptInFileSystem(
       await kernelTarget.buildOutlines();
       program = await kernelTarget.buildProgram();
       if (kernelTarget.errors.isNotEmpty) {
-        return new CompilationResult.errors(kernelTarget.errors
-            .map((err) => err.toString())
-            .toList(growable: false));
+        return new CompilationResult.errors(kernelTarget.errors);
       }
     } on InputError catch (e) {
       return new CompilationResult.error(e.format());