extend comment

Author: Thorsten Schütt

llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp

@@ -1316,7 +1316,7 @@ AArch64LegalizerInfo::AArch64LegalizerInfo(const AArch64Subtarget &ST)
       .widenScalarOrEltToNextPow2(0)
       .immIdx(0); // Inform verifier imm idx 0 is handled.
 
-  // TODO: {nxv8s16, s16}
+  // TODO: {nxv16s8, s8}, {nxv8s16, s16}
   getActionDefinitionsBuilder(G_SPLAT_VECTOR)
       .legalFor(HasSVE, {{nxv4s32, s32}, {nxv2s64, s64}});