Support longs in the register allocator for x86_64.

Change-Id: I7fb6dfb761bc5cf9e5705682032855a0a70ca867
diff --git a/compiler/optimizing/code_generator.h b/compiler/optimizing/code_generator.h
index 83621e0..ae2f030 100644
--- a/compiler/optimizing/code_generator.h
+++ b/compiler/optimizing/code_generator.h
@@ -90,6 +90,7 @@
   virtual void SetupBlockedRegisters(bool* blocked_registers) const = 0;
   virtual void DumpCoreRegister(std::ostream& stream, int reg) const = 0;
   virtual void DumpFloatingPointRegister(std::ostream& stream, int reg) const = 0;
+  virtual InstructionSet GetInstructionSet() const = 0;
 
   void RecordPcInfo(uint32_t dex_pc) {
     struct PcInfo pc_info;