[AMDGPU] New GFX12 aliases lds_direct_load and lds_param_load (llvm#119205)

This is for compatibility with SP3.

Author: jayfoad

llvm/lib/Target/AMDGPU/DSDIRInstructions.td

@@ -193,3 +193,8 @@ multiclass DSDIR_Real_gfx12<bits<2> op> {
 
 defm DS_PARAM_LOAD : DSDIR_Real_gfx12<0x0>;
 defm DS_DIRECT_LOAD : DSDIR_Real_gfx12<0x1>;
+
+let SubtargetPredicate = isGFX12Plus in {
+  def : AMDGPUMnemonicAlias<"lds_param_load", "ds_param_load">;
+  def : AMDGPUMnemonicAlias<"lds_direct_load", "ds_direct_load">;
+}

llvm/test/MC/AMDGPU/gfx12_asm_vdsdir_alias.s

@@ -0,0 +1,8 @@
+// NOTE: Assertions have been autogenerated by utils/update_mc_test_checks.py UTC_ARGS: --version 5
+// RUN: llvm-mc -triple=amdgcn -mcpu=gfx1200 -show-encoding %s | FileCheck -check-prefix=GFX12 %s
+
+lds_direct_load v0
+// GFX12: ds_direct_load v0 wait_va_vdst:0 wait_vm_vsrc:0 ; encoding: [0x00,0x00,0x10,0xce]
+
+lds_param_load v0, attr0.x
+// GFX12: ds_param_load v0, attr0.x wait_va_vdst:0 wait_vm_vsrc:0 ; encoding: [0x00,0x00,0x00,0xce]