[AMDGPU][Disassembler] Pre-commit a test on an error message generated in an instruction comment.

Author: kosarev

llvm/test/MC/Disassembler/AMDGPU/comments.txt

@@ -0,0 +1,5 @@
+# RUN: llvm-mc -assemble -triple=amdgcn--amdhsa -mcpu=gfx1100 -filetype=obj %s -o - | \
+# RUN:   llvm-objdump -d - | FileCheck %s
+
+; CHECK: v_perm_b32 v14, v52, v51, 0x5040100 // 000000000000: D644000E 03FE6734 05040100 ; Error: cannot read literal, inst bytes left 0{{$}}
+  v_perm_b32 v14, v52, v51, 0x5040100