Optimize functions containing try-catch.

runtime/vm/assembler_x64.h

 // Copyright (c) 2013, 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.
 
 #ifndef VM_ASSEMBLER_X64_H_
 #define VM_ASSEMBLER_X64_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_x64.h directly; use assembler.h instead.
 #endif
@@ skipping 73 matching lines @@
     memmove(&encoding_[0], &other.encoding_[0], other.length_);
   }
 
   Operand& operator=(const Operand& other) {
     length_ = other.length_;
     rex_ = other.rex_;
     memmove(&encoding_[0], &other.encoding_[0], other.length_);
     return *this;
   }
 
+  bool Equals(const Operand& other) {
+    if (length_ != other.length_) return false;
+    if (rex_ != other.rex_) return false;
+    for (uint8_t i = 0; i < length_; i++) {
+      if (encoding_[i] != other.encoding_[i]) return false;
+    }
+    return true;
+  }
+
  protected:
   Operand() : length_(0), rex_(REX_NONE) { }  // Needed by subclass Address.
 
   void SetModRM(int mod, Register rm) {
     ASSERT((mod & ~3) == 0);
     if ((rm > 7) && !((rm == R12) && (mod != 3))) {
       rex_ |= REX_B;
     }
     encoding_[0] = (mod << 6) | (rm & 7);
     length_ = 1;
@@ skipping 805 matching lines @@
 }
 
 
 inline void Assembler::EmitOperandSizeOverride() {
   EmitUint8(0x66);
 }
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_X64_H_