Remove compiler flags that no longer exist from script

inputs/collect-facts.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 RUSTC_RELEASE="stage1"
-RUSTC_ARGS="-Znll-facts -Zborrowck=mir"
+RUSTC_ARGS=-Znll-facts
 INPUT_FOLDERS=(issue-47680 smoke-test vec-push-ref subset-relations)
 
 for test_folder in "${INPUT_FOLDERS[@]}";