[vm/compiler] Remove left-over free in unit_test.cc (we attach a finalizer now to the ExternalTypedData)

A follow-up change to https://dart-review.googlesource.com/c/sdk/+/103130

Change-Id: Ib3f39bc8233e0c475af27c581fa03824c2577a68
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103420
Reviewed-by: Martin Kustermann <kustermann@google.com>
Auto-Submit: Martin Kustermann <kustermann@google.com>
diff --git a/runtime/vm/unit_test.cc b/runtime/vm/unit_test.cc
index 8cbd3fc..55e8623 100644
--- a/runtime/vm/unit_test.cc
+++ b/runtime/vm/unit_test.cc
@@ -693,8 +693,6 @@
     val = lib.EvaluateCompiledExpression(kernel_td, Array::empty_array(),
                                          param_values,
                                          TypeArguments::null_type_arguments());
-
-    free(const_cast<uint8_t*>(kernel_bytes));
   }
   return Api::NewHandle(thread, val.raw());
 }