[gardening] Update status for #34901

Issue: dart-lang/sdk#34901
Change-Id: Iaa0d082a0d4e0ddd034f51f49fc9b722a0ca3fd4
Reviewed-on: https://dart-review.googlesource.com/c/81281
Commit-Queue: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Régis Crelier <regis@google.com>
Auto-Submit: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Régis Crelier <regis@google.com>

tests/corelib_2/corelib_2.status

@@ -60,7 +60,8 @@ int_modulo_arith_test/none: RuntimeError
 string_from_environment3_test/03: Crash
 
 [ $compiler == dartkb ]
-bigint_test: Skip # Switching from non-intrinsic version to intrinsics on the fly causes invariants "assert(d0 == d1)" and "assert(d == _digitsPerStep)" in bigint_patch.dart to break, which leads to flaky RuntimeError / Timeout failures.
+bigint_from_test: RuntimeError, Pass # Issue 34901
+bigint_test: Skip # Issue 34901
 
 [ $compiler == fasta ]
 bool_from_environment2_test/03: MissingCompileTimeError