Add negation to single-identifier tests in status files.

pkg/pkg.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Don't run any test-like files that show up in packages directories. It
 # shouldn't be necessary to run "pub install" in these packages, but if you do
 # it shouldn't break the tests.
 */packages/*/*: Skip
 */*/packages/*/*: Skip
 */*/*/packages/*/*: Skip
@@ skipping 70 matching lines @@
 analyzer/test/src/summary/resynthesize_ast_test: Pass, Slow
 analyzer/test/src/task/strong/front_end_inference_test: Pass, Slow
 
 [ $runtime == vm && $checked && $system == windows ]
 front_end/tool/perf_test: Slow, Pass
 
 [ $runtime == vm && $use_sdk ]
 front_end/test/fasta/*: Skip # Issue 28629
 compiler/tool/generate_kernel_test*: Skip # Issue 28629
 
-[ $runtime == vm && $use_sdk == false ]
+[ $runtime == vm && ! $use_sdk ]
 front_end/tool/perf_test: Skip # Issue 28698
 
-[ $runtime == vm && $use_sdk == true ]
+[ $runtime == vm && $use_sdk ]

[Bob Nystrom, 2017/06/01 23:07:45]

It would be super great to go through all the status files and remove uses of
the negated variables ("unchecked", "host_unchecked", etc.) Then remove support
for them in Environment.

Even better would also be to remove all uses of "== true", "== false", "!=
true", etc.

Even best would be to then remove support for comparing boolean variables to
true and false as literal values. Only allow them as direct variable
expressions, not comparisons.

Any of this could be left to later CLs, but TODOs would be nice.

[Lasse Reichstein Nielsen, 2017/06/07 08:51:48]

I'll just do it.
https://xkcd.com/208/

 front_end/tool/fasta_perf_test: SkipByDesign # depends on patched_sdk which is not built into the sdk
 
 [ $runtime == vm && $system == windows]
 analysis_server/*: Skip # Issue 27557
 analysis_server/test/analysis/get_errors_test: Skip # runtime error, Issue 22180
 analysis_server/test/integration/analysis/analysis_options_test: RuntimeError # Issue 24796
 analyzer/test/generated/all_the_rest_test: Fail # Issue 21772
 analyzer/test/generated/source_factory_test: RuntimeError # Issue 26828
 kernel/test/baseline_spec_mode_test: RuntimeError # Issue 28243
 kernel/test/baseline_strong_mode_test: RuntimeError # Issue 28243
@@ skipping 100 matching lines @@
 *: SkipByDesign # The pkg test framework imports dart:mirrors.
 
 [ $compiler == none ]
 kernel/test/closures_test: Fail
 
 [ $runtime == vm ]
 analyzer_cli/test/driver_test: Pass, Slow
 
 [ $runtime == vm && $system == windows ]
 analyzer/test/src/task/strong/checker_test: Pass, Slow