fixup! Add -o - to test.

Author: topperc

llvm/test/CodeGen/RISCV/fold-mem-offset.mir

@@ -1,5 +1,5 @@
 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
-# RUN: llc %s -mtriple=riscv32 -run-pass=riscv-fold-mem-offset -verify-machineinstrs | FileCheck %s
+# RUN: llc %s -mtriple=riscv32 -run-pass=riscv-fold-mem-offset -verify-machineinstrs -o - | FileCheck %s
 
 ---
 name:            crash