Follow LLVM convention.

Author: PrasoonMishra

llvm/test/CodeGen/AMDGPU/phi-elim-mli-available.mir

@@ -1,5 +1,5 @@
 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 6
-# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -run-pass=machine-loops,livevars,phi-node-elimination -no-phi-elim-live-out-early-exit -filetype=null %s 2>&1 | FileCheck %s
+# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -run-pass=machine-loops,livevars,phi-node-elimination -no-phi-elim-live-out-early-exit -o - %s | FileCheck %s
 
 # Test that PHIElimination accesses MachineLoopInfo if available for
 # loop-aware edge splitting. The -no-phi-elim-live-out-early-exit flag