Compile LDC2 with VS2010 64bit (LDC changes only).

Contains all changes necessary to LDC specific source to compile LDC2 with VS2010. See https://github.com/D-Programming-Language/dmd/pull/516 for necessary changes to DMDFE.

ir/irdsymbol.h

@@ -14,7 +14,7 @@ struct IrVar;
 struct Dsymbol;
 
 namespace llvm {
-    struct Value;
+    class Value;
 }
 
 struct IrDsymbol

ir/irfuncty.h

@@ -84,6 +84,7 @@ struct IrFuncTy : IrBase
 
     IrFuncTy()
     :   ret(NULL),
+	    args(),
         arg_sret(NULL),
         arg_this(NULL),
         arg_nest(NULL),
@@ -93,11 +94,47 @@ struct IrFuncTy : IrBase
         reverseParams(false),
         is_arg_this_ref(false)
     {}
-    
+
+#if defined(_MSC_VER)
+    // Copy constructor and operator= seems to be requreid for MSC
+
+    IrFuncTy(const IrFuncTy& rhs)
+    :   ret(rhs.ret),
+        args(IrFuncTy::ArgList(rhs.args)),
+        arg_sret(rhs.arg_sret),
+        arg_this(rhs.arg_this),
+        arg_nest(rhs.arg_nest),
+        arg_arguments(rhs.arg_arguments),
+        arg_argptr(rhs.arg_argptr),
+        c_vararg(rhs.c_vararg),
+        reverseParams(rhs.reverseParams),
+        is_arg_this_ref(rhs.is_arg_this_ref)
+    {}
+
+    IrFuncTy& operator=(const IrFuncTy& rhs)
+    {
+        ret = rhs.ret;
+        args = IrFuncTy::ArgList(rhs.args);
+        arg_sret = rhs.arg_sret;
+        arg_this = rhs.arg_this;
+        arg_nest = rhs.arg_nest;
+        arg_arguments = rhs.arg_arguments;
+        arg_argptr = rhs.arg_argptr;
+        c_vararg = rhs.c_vararg;
+        reverseParams = rhs.reverseParams;
+        is_arg_this_ref = rhs.is_arg_this_ref;
+        return *this;
+    }
+#endif
+
     void reset() {
         ret = NULL;
         arg_sret = arg_this = arg_nest = arg_arguments = arg_argptr = NULL;
+#if defined(_MSC_VER)
+        args = IrFuncTy::ArgList();
+#else
         args.clear();
+#endif
         c_vararg = false;
         reverseParams = false;
     }

ir/irtype.cpp

@@ -12,7 +12,7 @@
 //////////////////////////////////////////////////////////////////////////////
 
 extern LLType* DtoType(Type* dt);
-extern LLType* DtoSize_t();
+extern LLIntegerType* DtoSize_t();
 
 //////////////////////////////////////////////////////////////////////////////