Introduce Jump and Call operand macro assembler instructions for x64

src/x64/assembler-x64.h

Index: src/x64/assembler-x64.h
diff --git a/src/x64/assembler-x64.h b/src/x64/assembler-x64.h
index ef513d1e534801382c0f385a3930e7f3597e93ed..06aa17d6caba9a1078dc3afe995eaacc08c575e5 100644
--- a/src/x64/assembler-x64.h
+++ b/src/x64/assembler-x64.h
@@ -1260,9 +1260,6 @@ class Assembler : public AssemblerBase {
   // Call near absolute indirect, address in register
   void call(Register adr);
 
-  // Call near indirect
-  void call(const Operand& operand);
-
   // Jumps
   // Jump short or near relative.
   // Use a 32-bit signed displacement.
@@ -1274,9 +1271,6 @@ class Assembler : public AssemblerBase {
   // Jump near absolute indirect (r64)
   void jmp(Register adr);
 
-  // Jump near absolute indirect (m64)
-  void jmp(const Operand& src);
-
   // Conditional jumps
   void j(Condition cc,
          Label* L,
@@ -1499,6 +1493,13 @@ class Assembler : public AssemblerBase {
   byte byte_at(int pos)  { return buffer_[pos]; }
   void set_byte_at(int pos, byte value) { buffer_[pos] = value; }
 
+ protected:
+  // Call near indirect
+  void call(const Operand& operand);
+
+  // Jump near absolute indirect (m64)
+  void jmp(const Operand& src);
+
  private:
   byte* addr_at(int pos)  { return buffer_ + pos; }
   uint32_t long_at(int pos)  {