[AMDGPU] Add a RUN line to test the OSABI-PAL-ERR prefix

Author: jayfoad

llvm/test/MC/AMDGPU/isa-version-pal.s

@@ -5,6 +5,7 @@
 // RUN: llvm-mc -triple amdgcn-amd-amdpal -mcpu=gfx802 %s | FileCheck --check-prefix=OSABI-PAL %s
 // RUN: llvm-mc -triple amdgcn-amd-amdpal -mcpu=iceland %s | FileCheck --check-prefix=OSABI-PAL %s
 // RUN: not llvm-mc -triple amdgcn-amd-unknown -mcpu=gfx802 %s 2>&1 | FileCheck --check-prefix=OSABI-UNK-ERR %s
+// RUN: not llvm-mc -triple amdgcn-amd-amdpal -mcpu=gfx803 %s 2>&1 | FileCheck --check-prefix=OSABI-PAL-ERR %s
 
 // OSABI-PAL: .amd_amdgpu_isa "amdgcn-amd-amdpal--gfx802"
 // OSABI-UNK-ERR: error: target id must match options