Add some missing x64 instruction variations.

runtime/vm/assembler_x64.h

Index: runtime/vm/assembler_x64.h
===================================================================
--- runtime/vm/assembler_x64.h	(revision 9573)
+++ runtime/vm/assembler_x64.h	(working copy)
@@ -380,18 +380,22 @@
   void xorl(Register dst, Register src);
 
   void andq(Register dst, Register src);
+  void andq(Register dst, const Address& address);
   void andq(Register dst, const Immediate& imm);
 
   void orq(Register dst, Register src);
+  void orq(Register dst, const Address& address);
   void orq(Register dst, const Immediate& imm);
 
   void xorq(Register dst, Register src);
+  void xorq(Register dst, const Address& address);
 
   void addl(Register dst, Register src);
   void addl(const Address& address, const Immediate& imm);
 
   void addq(Register dst, Register src);
   void addq(Register reg, const Immediate& imm);
+  void addq(Register reg, const Address& address);
   void addq(const Address& address, const Immediate& imm);
   void addq(const Address& address, Register reg);
 
@@ -409,6 +413,7 @@
   void imull(Register reg, const Immediate& imm);
 
   void imulq(Register dst, Register src);
+  void imulq(Register dst, const Address& address);
 
   void subq(Register dst, Register src);
   void subq(Register reg, const Immediate& imm);