fix comments

Author: shiltian

llvm/test/CodeGen/AMDGPU/use-after-free-after-cleanup-failed-vreg.ll

@@ -1,6 +1,6 @@
-; RUN: not llc -mcpu=gfx1100 -mtriple=amdgcn-amd-amdhsa -stress-regalloc=4 %s 2>&1 | FileCheck %s
+; RUN: not llc -mcpu=gfx1100 -mtriple=amdgcn-amd-amdhsa -stress-regalloc=4 -filetype=null -verify-machineinstrs %s 2>&1 | FileCheck %s
 
-; CHECK: ran out of registers during register allocation in function 'f'
+; CHECK: error: <unknown>:0:0: ran out of registers during register allocation in function 'f'
 
 define <16 x half> @f(i1 %LGV2, <16 x half> %0) {
 BB: