[AMDGPU] Make use of defvar in DSDIR definitions. NFC.

Author: jayfoad

llvm/lib/Target/AMDGPU/DSDIRInstructions.td

@@ -159,8 +159,8 @@ def : GCNPat <
 // GFX11
 //===----------------------------------------------------------------------===//
 
-multiclass DSDIR_Real_gfx11<bits<2> op,
-                            DSDIR_Pseudo lds = !cast<DSDIR_Pseudo>(NAME)> {
+multiclass DSDIR_Real_gfx11<bits<2> op> {
+  defvar lds = !cast<DSDIR_Pseudo>(NAME);
   def _gfx11 : DSDIR_Real<lds, lds.InOperandList,
                           LDSDIR_getAsm<lds.is_direct>.ret,
                           SIEncodingFamily.GFX11>,
@@ -177,8 +177,8 @@ defm LDS_DIRECT_LOAD : DSDIR_Real_gfx11<0x1>;
 // GFX12+
 //===----------------------------------------------------------------------===//
 
-multiclass DSDIR_Real_gfx12<bits<2> op,
-                            DSDIR_Pseudo lds = !cast<DSDIR_Pseudo>(NAME)> {
+multiclass DSDIR_Real_gfx12<bits<2> op> {
+  defvar lds = !cast<DSDIR_Pseudo>(NAME);
   def _gfx12 : DSDIR_Real<lds, lds.InOperandList,
                           VDSDIR_getAsm<lds.is_direct>.ret,
                           SIEncodingFamily.GFX12>,