Fix missing diff run line

Author: arsenm

llvm/test/tools/llvm-objdump/ELF/AMDGPU/subtarget.ll

@@ -137,7 +137,6 @@ define amdgpu_kernel void @test_kernel() {
 
 ; ----------------------------------GFX9---------------------------------------
 ;
-
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa --amdhsa-code-object-version=6 -mcpu=gfx9-4-generic -filetype=obj -O0 -o %t.o %s
 ; RUN: llvm-objdump -D --arch-name=amdgcn -mllvm --amdhsa-code-object-version=6 --mcpu=gfx9-4-generic %t.o > %t-specify.txt
 ; RUN: llvm-objdump -D  -mllvm --amdhsa-code-object-version=6 %t.o > %t-detect.txt
@@ -146,11 +145,11 @@ define amdgpu_kernel void @test_kernel() {
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa --amdhsa-code-object-version=6 -mcpu=gfx9-generic -filetype=obj -O0 -o %t.o %s
 ; RUN: llvm-objdump -D --arch-name=amdgcn -mllvm --amdhsa-code-object-version=6 --mcpu=gfx9-generic %t.o > %t-specify.txt
 ; RUN: llvm-objdump -D  -mllvm --amdhsa-code-object-version=6 %t.o > %t-detect.txt
-;
+; RUN: diff %t-specify.txt %t-detect.txt
+
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx950 -filetype=obj -O0 -o %t.o %s
 ; RUN: llvm-objdump -D --arch-name=amdgcn --mcpu=gfx950 %t.o > %t-specify.txt
 ; RUN: llvm-objdump -D %t.o > %t-detect.txt
-;
 ; RUN: diff %t-specify.txt %t-detect.txt
 
 ; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx942 -filetype=obj -O0 -o %t.o %s