Code cleanup: Remove unnecessary parameter.

Change-Id: I978ba7857be99af643cf5377029662b056431e3c
diff --git a/src/compiler_llvm/compilation_unit.h b/src/compiler_llvm/compilation_unit.h
index 40a4c73..52e4ae6 100644
--- a/src/compiler_llvm/compilation_unit.h
+++ b/src/compiler_llvm/compilation_unit.h
@@ -133,8 +133,7 @@
   size_t mem_usage_;
   uint16_t num_elf_funcs_;
 
-  bool MaterializeToFile(llvm::raw_ostream& out_stream,
-                         InstructionSet insn_set);
+  bool MaterializeToFile(llvm::raw_ostream& out_stream);
 };
 
 } // namespace compiler_llvm