Avoid scanning huge freelists for large enough free blocks.

tests/standalone/standalone.status

Index: tests/standalone/standalone.status
diff --git a/tests/standalone/standalone.status b/tests/standalone/standalone.status
index 2fc1192253ff6486f3f359b76068d0c67cec9040..095a30cc81725eba97594a26ff807953cf351efb 100644
--- a/tests/standalone/standalone.status
+++ b/tests/standalone/standalone.status
@@ -148,6 +148,9 @@ io/file_stream_test: Skip # Issue 26109
 io/file_typed_data_test: Skip # Issue 26109
 io/file_input_stream_test: Skip # Issue 26109
 
+[ $runtime != vm || ($arch == arm || $arch == arm64 || $arch == mips) ]
+fragmentation_test: Skip # VM test uses too much memory for small systems.
+
 [ $compiler == dart2js && $jscl ]
 assert_test: RuntimeError, OK # Assumes unspecified fields on the AssertionError.
 deoptimization_test: RuntimeError, OK # Requires bigint.