[AMDGPU] Remove unnecessary predicates from aliases. NFC.

So long as the target of the alias is predicated with HasImageInsts or
similar, the alias itself does not need this predicate.

Author: jayfoad

llvm/lib/Target/AMDGPU/EXPInstructions.td

@@ -117,7 +117,7 @@ multiclass EXP_Real_gfx11 {
 multiclass VEXPORT_Real_gfx12 {
   defvar ps = !cast<EXP_Pseudo>(NAME);
   def _gfx12 : EXP_Real_Row<ps, SIEncodingFamily.GFX12, "export">,
-    EXPe_Row, MnemonicAlias<"exp", "export">, Requires<[isGFX12Plus, HasExportInsts]> {
+    EXPe_Row, MnemonicAlias<"exp", "export">, Requires<[isGFX12Plus]> {
     let AssemblerPredicate = isGFX12Only;
     let DecoderNamespace = "GFX12";
     let row = ps.row;

llvm/lib/Target/AMDGPU/MIMGInstructions.td

@@ -967,7 +967,7 @@ class VIMAGE_Atomic_gfx12_Renamed<mimgopc op, string opcode, string renamed,
                                   RegisterClass DataRC, int num_addrs,
                                   bit enableDisasm = 0>
    : VIMAGE_Atomic_gfx12<op, renamed, DataRC, num_addrs, enableDisasm>,
-     MnemonicAlias<opcode, renamed>, Requires<[isGFX12Plus, HasImageInsts]>;
+     MnemonicAlias<opcode, renamed>, Requires<[isGFX12Plus]>;
 
 multiclass MIMG_Atomic_Addr_Helper_m <mimgopc op, string asm,
                                       RegisterClass data_rc,