Add a new variable environment for testing, to replace the misusage of 'arch'.

dart/tests/language/language.status

Index: dart/tests/language/language.status
===================================================================
--- dart/tests/language/language.status	(revision 813)
+++ dart/tests/language/language.status	(working copy)
@@ -17,7 +17,7 @@
 prefix language
 
 
-[ $arch == ia32 || $arch == dartium ]
+[ $FOOBAR == vm || $FOOBAR == dartium ]
 ClassTest: Fail             # Bug 4504458 (pseudo keyword)
 NamingTest: Fail            # Bug 4504458 (pseudo keyword)
 SuperTest: Fail             # Bug 4995181
@@ -63,11 +63,11 @@
 # DartC specific tests that should not be run by the VM.
 *DartcTest: Skip
 
-[ $arch == ia32 && $mode == debug ]
+[ $FOOBAR == vm && $mode == debug ]
 NonParameterizedFactoryTest: Crash  # Issue 226
 
 # Problems specific to dartc optimized mode
-[ ($arch == dartc || $arch == chromium) && $mode == release ]
+[ ($FOOBAR == dartc || $FOOBAR == chromium) && $mode == release ]
 MethodInvocationTest: Fail               # Bug  5392266
 Label2NegativeTest: Crash                # Bug 5318228
 NullPointerExceptionTest: Fail           # Bug 5391976
@@ -78,10 +78,10 @@
 CTConst2Test: Fail                       # Codesite issue 124
 
 # Problems specific to dartc debug mode
-[ ($arch == dartc || $arch == chromium) && $mode == debug ]
+[ ($FOOBAR == dartc || $FOOBAR == chromium) && $mode == debug ]
 
 
-[ $arch == dartc || $arch == chromium ]
+[ $FOOBAR == dartc || $FOOBAR == chromium ]
 Library4NegativeTest: Fail               # Bug 5406175
 Prefix3NegativeTest: Fail                # Bug 5406175
 Prefix11NegativeTest: Fail               # Bug 5406175
@@ -179,7 +179,7 @@
 *VMTest: Skip
 
 
-[ $arch == dartium ]
+[ $FOOBAR == dartium ]
 # TODO: These need to be retriaged.
 ExpectTest: Fail
 StackTraceTest: Fail