Add hybrid assembler concept to ARM assembler.

src/IceAssemblerX86Base.h

Index: src/IceAssemblerX86Base.h
diff --git a/src/IceAssemblerX86Base.h b/src/IceAssemblerX86Base.h
index 6b8f3c1b0f531f1a3a10380ca66935e4961faec0..b1c70e082ad1700ab780d86de7819a5c561b11e5 100644
--- a/src/IceAssemblerX86Base.h
+++ b/src/IceAssemblerX86Base.h
@@ -885,7 +885,6 @@ private:
   inline void emitRegisterOperand(int rm, int reg);
   template <typename RegType, typename RmType>
   inline void emitXmmRegisterOperand(RegType reg, RmType rm);
-  inline void emitFixup(AssemblerFixup *fixup);
   inline void emitOperandSizeOverride();
 
   void emitOperand(int rm, const typename Traits::Operand &operand);
@@ -1063,11 +1062,6 @@ inline void AssemblerX86Base<Machine>::emitXmmRegisterOperand(RegType reg,
 }
 
 template <class Machine>
-inline void AssemblerX86Base<Machine>::emitFixup(AssemblerFixup *fixup) {
-  Buffer.emitFixup(fixup);
-}
-
-template <class Machine>
 inline void AssemblerX86Base<Machine>::emitOperandSizeOverride() {
   emitUint8(0x66);
 }