X87: enable the X87 turbofan support.

src/x87/disasm-x87.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>
 
 #include "src/v8.h"
 
@@ skipping 708 matching lines @@
         case 3: mnem = "fistp_s"; break;
         default: UnimplementedInstruction();
       }
       break;
 
     case 0xDC:
       switch (regop) {
         case 0:
           mnem = "fadd_d";
           break;
+        case 1:
+          mnem = "fmul_d";
+          break;
+        case 4:
+          mnem = "fsub_d";
+          break;
+        case 5:
+          mnem = "fsubr_d";
+          break;
+        case 6:
+          mnem = "fdiv_d";
+          break;
+        case 7:
+          mnem = "fdivr_d";
+          break;
         default:
           UnimplementedInstruction();
       }
       break;
 
     case 0xDD: switch (regop) {
         case 0: mnem = "fld_d"; break;
         case 1: mnem = "fisttp_d"; break;
         case 2: mnem = "fst_d"; break;
         case 3: mnem = "fstp_d"; break;
@@ skipping 1050 matching lines @@
       fprintf(f, "  ");
     }
     fprintf(f, "  %s\n", buffer.start());
   }
 }
 
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_X87