[llvm] [RISCV] Support zext.h mnemonic with Zbkb. (PR #96821)

[Pengcheng Wang via llvm-commits]

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@@ -415,22 +415,18 @@ let Predicates = [HasStdExtZbkb, IsRV64], IsSignExtendingOpW = 1 in
 def PACKW  : ALUW_rr<0b0000100, 0b100, "packw">,
              Sched<[WritePACK32, ReadPACK32, ReadPACK32]>;
 
-let Predicates = [HasStdExtZbb, IsRV32] in {
+let Predicates = [HasStdExtZbbOrZbkb, IsRV32] in {
+let IsSignExtendingOpW = 1 in
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wangpc-pp wrote:

Do we need `IsSignExtendingOpW` here?

https://github.com/llvm/llvm-project/pull/96821