Simplify code by using the right type.

Removes some comditional compiling by replacing unsigned with llvm::Attributes.

ir/irfunction.cpp

@@ -13,11 +13,7 @@
 //////////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////
 
-#if LDC_LLVM_VER == 300
-IrFuncTyArg::IrFuncTyArg(Type* t, bool bref, unsigned a) : type(t)
-#else
 IrFuncTyArg::IrFuncTyArg(Type* t, bool bref, llvm::Attributes a) : type(t)
-#endif
 {
     ltype = t != Type::tvoid && bref ? DtoType(t->pointerTo()) : DtoType(t);
     attrs = a;

ir/irfuncty.h

@@ -3,9 +3,7 @@
 
 #include "ir/ir.h"
 #include "llvm/ADT/SmallVector.h"
-#if LDC_LLVM_VER >= 301
 #include "llvm/Attributes.h"
-#endif
 
 #include <vector>
 
@@ -30,11 +28,7 @@ struct IrFuncTyArg : IrBase
 
     /** These are the final LLVM attributes used for the function.
      *  Must be valid for the LLVM Type and byref setting */
-#if LDC_LLVM_VER == 300
-    unsigned attrs;
-#else
     llvm::Attributes attrs;
-#endif
 
     /** 'true' if the final LLVM argument is a LLVM reference type.
      *  Must be true when the D Type is a value type, but the final
@@ -57,11 +51,7 @@ struct IrFuncTyArg : IrBase
      *  @param byref Initial value for the 'byref' field. If true the initial
      *               LLVM Type will be of DtoType(type->pointerTo()), instead
      *               of just DtoType(type) */
-#if LDC_LLVM_VER == 300
-    IrFuncTyArg(Type* t, bool byref, unsigned a = 0);
-#else
     IrFuncTyArg(Type* t, bool byref, llvm::Attributes a = llvm::Attribute::None);
-#endif
 };
 
 // represents a function type