cpsir unittests: move all unittests into individual files and test runners.

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 93e444f199186b678d3dab6142c0d05dffb6dece..3d0330e1577eb119bbbd380eedec84fbcedfe95c 100644
--- a/tests/compiler/dart2js/dart2js.status
+++ b/tests/compiler/dart2js/dart2js.status
@@ -47,22 +47,6 @@ backend_dart/opt_constprop_test: Skip
 backend_dart/opt_shrinking_test: Skip
 backend_dart/opt_redundant_phi_test: Skip
 
-# These tests are disabled because they have become ineffective.
-js_backend_cps_ir_basic_test: Skip
-js_backend_cps_ir_closures_test: Skip
-js_backend_cps_ir_codeUnitAt_test: Skip
-js_backend_cps_ir_constructor_test: Skip
-js_backend_cps_ir_control_flow_test: Skip
-js_backend_cps_ir_gvn_test: Skip
-js_backend_cps_ir_interceptors_test: Skip
-js_backend_cps_ir_literals_test: Skip
-js_backend_cps_ir_operators2_test: Skip
-js_backend_cps_ir_operators_test: Skip
-js_backend_cps_ir_runtime_types_test: Skip
-js_backend_cps_ir_supercall_test: Skip
-
-js_backend_cps_ir_argument_refinement_test: Pass, Slow # we invoke dart2js many times
-
 # Source information is not correct due to inlining.
 js_backend_cps_ir_source_information_test: Fail
 sourcemaps/source_mapping_operators_test: Fail # Issue 25304 for checked mode, was: Pass, Slow