Deleting LIR and such, wiring up for HIR->x64.

src/alloy/backend/x64/x64_assembler.h

@@ -21,8 +21,6 @@ namespace x64 {
 
 class X64Backend;
 class X64Emitter;
-namespace lir { class LIRBuilder; }
-namespace optimizer { class Optimizer; }
 
 
 class X64Assembler : public Assembler {
@@ -44,8 +42,6 @@ private:
 
 private:
   X64Backend*           x64_backend_;
-  lir::LIRBuilder*      builder_;
-  optimizer::Optimizer* optimizer_;
   X64Emitter*           emitter_;
 
   StringBuffer          string_buffer_;