Introduce InvokeMathCFunction that can be used to directly invoke mathematical function provided by…

runtime/vm/disassembler_x64.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_X64)
 #include "platform/utils.h"
 #include "vm/allocation.h"
@@ skipping 1491 matching lines @@
 
   const bool processed = DecodeInstructionType(&data);
 
   if (!processed) {
     switch (*data) {
       case 0xC2:
         AppendToBuffer("ret %#x", *reinterpret_cast<uint16_t*>(data + 1));
         data += 3;
         break;
 
+      case 0xC8:
+        AppendToBuffer("enter %d, %d",
+                       *reinterpret_cast<uint16_t*>(data + 1),
+                       data[3]);
+        data += 4;
+        break;
+
       case 0x69:  // fall through
       case 0x6B: {
         int mod, regop, rm;
         get_modrm(*(data + 1), &mod, &regop, &rm);
         int32_t imm = *data == 0x6B ? *(data + 2)
             : *reinterpret_cast<int32_t*>(data + 2);
         AppendToBuffer("imul%c %s,%s,%#x",
                        operand_size_code(),
                        NameOfCPURegister(regop),
                        NameOfCPURegister(rm), imm);
@@ skipping 344 matching lines @@
                                   human_buffer,
                                   sizeof(human_buffer),
                                   pc);
     pc += instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64