X87: enable the crankshaft compiler for X87 port.

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 53a8c2906703668e9622611fabbbce8d5b551426..46d92b3286791b047cf7516ebd3296c99d1070b4 100644
--- a/src/x87/disasm-x87.cc
+++ b/src/x87/disasm-x87.cc
@@ -702,7 +702,8 @@ int DisassemblerX87::MemoryFPUInstruction(int escape_opcode,
         case 0: mnem = "fld_s"; break;
         case 2: mnem = "fst_s"; break;
         case 3: mnem = "fstp_s"; break;
-        case 7: mnem = "fstcw"; break;
+        case 5: mnem = "fldcw"; break;
+        case 7: mnem = "fnstcw"; break;
         default: UnimplementedInstruction();
       }
       break;
@@ -716,11 +717,19 @@ int DisassemblerX87::MemoryFPUInstruction(int escape_opcode,
       }
       break;
 
+    case 0xDC: switch (regop) {
+        case 0: mnem = "fadd_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;
+        case 4: mnem = "frstor"; break;
+        case 6: mnem = "fnsave"; break;
         default: UnimplementedInstruction();
       }
       break;