[dart2dart] Rename --cut-declaration-types flag to --force-cut-declaration-types

lib/compiler/implementation/apiimpl.dart

Index: lib/compiler/implementation/apiimpl.dart
diff --git a/lib/compiler/implementation/apiimpl.dart b/lib/compiler/implementation/apiimpl.dart
index 931e426816bbc39b7e59e9b85b69aadffa12fbea..bc16bdb76f80583d5f9cc2d1fe8dedd8defa2d8a 100644
--- a/lib/compiler/implementation/apiimpl.dart
+++ b/lib/compiler/implementation/apiimpl.dart
@@ -31,7 +31,8 @@ class Compiler extends leg.Compiler {
             enableUserAssertions: hasOption(options, '--enable-checked-mode'),
             enableMinification: hasOption(options, '--minify'),
             emitJavaScript: !hasOption(options, '--output-type=dart'),
-            cutDeclarationTypes: hasOption(options, '--cut-declaration-types'));
+            forceCutDeclarationTypes:
+                hasOption(options, '--force-cut-declaration-types'));
 
   static bool hasOption(List<String> options, String option) {
     return options.indexOf(option) >= 0;