Add negation to single-identifier tests in status files.

tests/corelib/corelib.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.
 
 [ $compiler == none && ($runtime == drt || $runtime == dartium) ]
 bool_from_environment2_test: Skip
 bool_from_environment_test: Skip
 from_environment_const_type_test: Skip
 from_environment_const_type_undefined_test: Skip
 int_from_environment2_test: Skip
@@ skipping 118 matching lines @@
 string_split_test: RuntimeError # Issue 21431
 
 [ $compiler == dart2js && $runtime == safarimobilesim ]
 list_test/01: Fail # Safari bug: Array(-2) seen as dead code.
 string_trimlr_test/01: Fail
 string_trimlr_test/02: RuntimeError # Uses Unicode 6.2.0 or earlier.
 
 [ $compiler == dart2js && ($runtime == ff || $runtime == jsshell) ]
 string_case_test/01: Fail, OK  # Bug in Firefox.
 
-[ $compiler == dart2js && $runtime == jsshell && $fast_startup == false]
+[ $compiler == dart2js && $runtime == jsshell && ! $fast_startup]
 list_test/none: RuntimeError # Issue 27871, Issue 28014, proably Bug in jsshell / Firefox
 list_test/01: RuntimeError # Issue 27871, Issue 28014, proably Bug in jsshell / Firefox
 
 [ $compiler == dart2js && $runtime == dartium ]
 string_case_test/02: Fail, OK  # Bug in dartium version of V8.
 string_case_test/03: Fail, OK  # Bug in dartium version of V8.
 
 # Analyzer's implementation of fromEnvironment assumes that undefined
 # environment variables have an unspecified value (rather than being
 # null) because it is expected that the user will supply a value when
@@ skipping 31 matching lines @@
 
 [ $runtime == vm || $runtime == dart_precompiled || $runtime == flutter]
 regexp/global_test: Skip # Timeout. Issue 21709 and 21708
 regexp/pcre_test: Pass, Slow, Timeout # Issues 21593 and 22008
 
 [ $runtime != vm && $runtime != dart_precompiled && $compiler != dart2analyzer]
 data_resource_test: RuntimeError # Issue 23825 (not implemented yet).
 file_resource_test: Skip, OK # VM specific test, uses dart:io.
 http_resource_test: Skip, OK # VM specific test, uses dart:io.
 
-[ $compiler == dart2js && $browser == false ]
+[ $compiler == dart2js && ! $browser ]
 package_resource_test: RuntimeError # Issue 26842
 
 [ $mode == debug ]
 regexp/pcre_test: Pass, Slow # Timeout. Issue 22008
 
 [ ($runtime == vm || $runtime == dart_precompiled) && $arch == simarmv5te ]
 int_parse_radix_test/*: Pass, Slow
 big_integer_parsed_mul_div_vm_test: Pass, Slow
 
 [ $compiler == precompiler || $mode == product ]
@@ skipping 136 matching lines @@
 from_environment_const_type_test/07: MissingCompileTimeError # Flutter Issue 9111
 from_environment_const_type_test/08: MissingCompileTimeError # Flutter Issue 9111
 from_environment_const_type_test/09: MissingCompileTimeError # Flutter Issue 9111
 from_environment_const_type_test/12: MissingCompileTimeError # Flutter Issue 9111
 from_environment_const_type_test/11: MissingCompileTimeError # Flutter Issue 9111
 from_environment_const_type_test/13: MissingCompileTimeError # Flutter Issue 9111
 from_environment_const_type_test/14: MissingCompileTimeError # Flutter Issue 9111
 from_environment_const_type_test/16: MissingCompileTimeError # Flutter Issue 9111
 string_trimlr_test/02: RuntimeError # Flutter Issue 9111
 main_test: RuntimeError # Flutter Issue 9111