[AMDGPU][mc] Fix AddressSanitizer leftover issue in gfx7_asm_all test

Issue occurs when assembling "ds_ordered_count v0, v0 gds".

llvm-svn: 294004
diff --git a/llvm/lib/Target/AMDGPU/DSInstructions.td b/llvm/lib/Target/AMDGPU/DSInstructions.td
index a077001..7f7aa18 100644
--- a/llvm/lib/Target/AMDGPU/DSInstructions.td
+++ b/llvm/lib/Target/AMDGPU/DSInstructions.td
@@ -174,6 +174,7 @@
   let has_data1 = 0;
   let has_gds = 0;
   let gdsValue = 1;
+  let AsmMatchConverter = "cvtDSGds";
 }
 
 class DS_0A_RET <string opName> : DS_Pseudo<opName,