AMDGPU: Remove the unnecessary needAlias argument in DS_Real_gfx12 (#146439)

Author: changpeng

llvm/lib/Target/AMDGPU/DSInstructions.td

@@ -1326,14 +1326,14 @@ class Base_DS_Real_gfx6_gfx7_gfx10_gfx11_gfx12<bits<8> op, DS_Pseudo ps, int ef,
 // GFX12.
 //===----------------------------------------------------------------------===//
 
-multiclass DS_Real_gfx12<bits<8> op, string name = !tolower(NAME), bit needAlias = true> {
+multiclass DS_Real_gfx12<bits<8> op, string name = !tolower(NAME)> {
   defvar ps = !cast<DS_Pseudo>(NAME);
   let AssemblerPredicate = isGFX12Plus in {
     let DecoderNamespace = "GFX12" in
       def _gfx12 :
         Base_DS_Real_gfx6_gfx7_gfx10_gfx11_gfx12<op, ps, SIEncodingFamily.GFX12,
                                                name, /*hasGDS=*/false>;
-    if !and(needAlias, !ne(ps.Mnemonic, name)) then
+    if !ne(ps.Mnemonic, name) then
       def : AMDGPUMnemonicAlias<ps.Mnemonic, name>;
   } // End AssemblerPredicate
 }
@@ -1362,7 +1362,7 @@ defm DS_LOAD_TR16_B128    : DS_Real_gfx12<0x0fc>;
 defm DS_LOAD_TR8_B64      : DS_Real_gfx12<0x0fd>;
 
 defm DS_BVH_STACK_RTN_B32             : DS_Real_gfx12<0x0e0,
-  "ds_bvh_stack_push4_pop1_rtn_b32", true>;
+  "ds_bvh_stack_push4_pop1_rtn_b32">;
 defm DS_BVH_STACK_PUSH8_POP1_RTN_B32  : DS_Real_gfx12<0x0e1>;
 defm DS_BVH_STACK_PUSH8_POP2_RTN_B64  : DS_Real_gfx12<0x0e2>;