PPC: Add VX_OPCODE_C_FORM instructions to the disassembler

Instructions include:
vupkhsw
vupklsh
vupkhsh
vupklsb
vupkhsb

Change-Id: Ie11961dbf1f4838e96efe6704c8d938a62213b93
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2601660Reviewed-by: Junliang Yan <junyan@redhat.com>
Reviewed-by: Milad Fa <mfarazma@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#71872}

src/diagnostics/ppc/disasm-ppc.cc

@@ -428,6 +428,13 @@ void Decoder::DecodeExt0(Instruction* instr) {
   }
     PPC_VX_OPCODE_B_FORM_LIST(DECODE_VX_B_FORM__INSTRUCTIONS)
 #undef DECODE_VX_B_FORM__INSTRUCTIONS
+#define DECODE_VX_C_FORM__INSTRUCTIONS(name, opcode_name, opcode_value) \
+  case opcode_name: {                                                   \
+    Format(instr, #name " 'Vt, 'Vb");                                   \
+    return;                                                             \
+  }
+    PPC_VX_OPCODE_C_FORM_LIST(DECODE_VX_C_FORM__INSTRUCTIONS)
+#undef DECODE_VX_C_FORM__INSTRUCTIONS
   }
 }