Remove unreachable x64-specific function.

Review URL: http://codereview.chromium.org/113635

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@2032 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/assembler-x64-inl.h

@@ -197,14 +197,6 @@ void Operand::set_disp32(int32_t disp) {
 }
 
 
-void Operand::set_dispr(intptr_t disp, RelocInfo::Mode rmode) {
-  // This cannot be used in 64-bit mode.  A 64-bit displacement
-  // cannot be encoded, so relocatable 64-bit values must be
-  // loaded as immediates.
-  UNIMPLEMENTED();
-}
-
-
 Operand::Operand(Register reg) {
   // reg
   set_modrm(3, reg);

src/x64/assembler-x64.h

@@ -297,7 +297,6 @@ class Operand BASE_EMBEDDED {
   inline void set_sib(ScaleFactor scale, Register index, Register base);
   inline void set_disp8(int8_t disp);
   inline void set_disp32(int32_t disp);
-  inline void set_dispr(intptr_t disp, RelocInfo::Mode rmode);
 
   friend class Assembler;
 };