[wasm] Int64Lowering of I64ShrU and I64ShrS on ia32.

src/ia32/disasm-ia32.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <assert.h>
 #include <stdarg.h>
 #include <stdio.h>
 
 #if V8_TARGET_ARCH_IA32
 
@@ skipping 1466 matching lines @@
           } else if ((f0byte & 0xF0) == 0x80) {
             data += JumpConditional(data, branch_hint);
           } else if (f0byte == 0xBE || f0byte == 0xBF || f0byte == 0xB6 ||
                      f0byte == 0xB7 || f0byte == 0xAF) {
             data += 2;
             data += PrintOperands(f0mnem, REG_OPER_OP_ORDER, data);
           } else if ((f0byte & 0xF0) == 0x90) {
             data += SetCC(data);
           } else if ((f0byte & 0xF0) == 0x40) {
             data += CMov(data);
-          } else if (f0byte == 0xA4) {
+          } else if (f0byte == 0xA4 || f0byte == 0xAC) {
+            // shld, shrd
             data += 2;
             AppendToBuffer("%s ", f0mnem);
             int mod, regop, rm;
             get_modrm(*data, &mod, &regop, &rm);
             int8_t imm8 = static_cast<int8_t>(data[1]);
             data += 2;
             AppendToBuffer("%s,%s,%d", NameOfCPURegister(rm),
                            NameOfCPURegister(regop), static_cast<int>(imm8));
           } else if (f0byte == 0xAB || f0byte == 0xA5 || f0byte == 0xAD) {
-            // shrd, shld_cl, bts
+            // shrd_cl, shld_cl, bts
             data += 2;
             AppendToBuffer("%s ", f0mnem);
             int mod, regop, rm;
             get_modrm(*data, &mod, &regop, &rm);
             data += PrintRightOperand(data);
             if (f0byte == 0xAB) {
               AppendToBuffer(",%s", NameOfCPURegister(regop));
             } else {
               AppendToBuffer(",%s,cl", NameOfCPURegister(regop));
             }
@@ skipping 774 matching lines @@
       fprintf(f, "  ");
     }
     fprintf(f, "  %s\n", buffer.start());
   }
 }
 
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_IA32