X87: enable the X87 turbofan support.

src/x87/disasm-x87.cc

Index: src/x87/disasm-x87.cc
diff --git a/src/x87/disasm-x87.cc b/src/x87/disasm-x87.cc
index ce7ac14f6d1bc212ab8ab3ef78dd16d6cd2e809c..009bebbc275bb8921172efb2a45983d35e0192f6 100644
--- a/src/x87/disasm-x87.cc
+++ b/src/x87/disasm-x87.cc
@@ -726,6 +726,21 @@ int DisassemblerX87::MemoryFPUInstruction(int escape_opcode,
         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();
       }