dart2js cps: Remove dart2dart from cps pipeline and clean up.

tests/compiler/dart2js/dart2js.status

Index: tests/compiler/dart2js/dart2js.status
diff --git a/tests/compiler/dart2js/dart2js.status b/tests/compiler/dart2js/dart2js.status
index fa4a8bb3275ca21ff98fa72999c39ec2a4358279..fa809e3fb78e443be99b62f169fc3e6704084e22 100644
--- a/tests/compiler/dart2js/dart2js.status
+++ b/tests/compiler/dart2js/dart2js.status
@@ -32,6 +32,16 @@ mirrors/library_imports_shown_test: Fail
 
 patch_test/bug: RuntimeError # Issue 21132
 
+# These tests are for the now-deleted dart2dart variant of the CPS IR.
+# We want to adapt them to test the JS variant of the CPS IR instead,
+# but for now they are disabled.
+backend_dart/end2end_test: Skip
+backend_dart/sexpr2_test: Skip
+backend_dart/sexpr_test: Skip
+backend_dart/opt_constprop_test: Skip
+backend_dart/opt_shrinking_test: Skip
+backend_dart/opt_redundant_phi_test: Skip
+
 [ $unchecked ]
 exit_code_test: Skip # This tests requires checked mode.