Delete CPS IR

tests/compiler/dart2js/cps_ir/README.md

-# CPS IR unit tests
-
-This folder contains unit tests of the CPS IR. These tests run the compiler with
-the cps IR and check for the output of a specific function (typically main).
-
-To make our lives easier, most files here are autogenerated. You should never
-have to edit a file under `expected/` or any file with an `AUTOGENERATED` header
-(including the `_test.dart` files).
-
-See instructions below to add or update tests.
-
-### Adding a new test
-
-Every test has 3 files: an input file, a test runner file, and an expectation
-file. The last two are auto-generated.  Here is how:
-
-* add a file under `input/` with a unique name, such as `foo_bar.dart`. Do not
-  include `_test` in the name of this file, otherwise the test framework will
-  think this test needs to be run directly in the vm and in a browser, that's
-  not our goal.
-
-* generate the corresponding test file, by running the `up_to_date_test.dart`
-  passing `update` as an argument:
-
-```bash
-dart tests/compiler/dart2js/cps_ir/up_to_date_test.dart update
-```
-
-  This will generate a file `foo_bar_test.dart` on this folder.
-
-* generate the expectations of the test file by running the generated test file
-  with `update` as an argument:
-
-```bash
-dart --package-root=out/ReleaseX64/packages tests/compiler/dart2js/cps_ir/foo_bar_test.dart update
-```
-
-  This will generate a file `expected/foo_bar.js` with the expected output.
-
-### Checking a method other than main
-
-By default, the test expectations will be generated to contain just the body of
-the main function. If you wish to check for a different element, include a
-comment at the top of the input test like this:
-```dart
-// Method to test: function(foo)
-```
-The trailing text should match the string representation of a compiler element.
-
-**Note**: this format will likely change in the future. We would like to have a
-canonical way to refer to elements that is independent of the internal compiler
-implementation, we also want a way to specify more than just one element, and a
-way to specify that an element has been tree-shaken.
-
-### Updating a single test expectation
-
-To update the expectations of a test, simply regenerate it by running the test
-file with `update` as an argument:
-
-```bash
-dart --package-root=out/ReleaseX64/packages tests/compiler/dart2js/cps_ir/foo_bar_test.dart update
-```
-
-This will override the file `expected/foo_bar.js` file with the new output.
-
-If a test fails because the expectations are out of date, you'll see this
-suggestion in the failure message too.
-
-### Updating all test expectations
-
-For convenience, we also provide a script to update all expectations at once.
-
-```bash
-dart --package-root=out/ReleaseX64/packages tests/compiler/dart2js/cps_ir/update_all.dart
-```
-
-It is equivalent to update each test individually. This script can be handy when
-making cross-cutting changes that affect the output of most tests.