add complex type support to drwrap_get_arg

_From [loveker...@gmail.com](https://code.google.com/u/116484344188732790868/) on March 02, 2013 12:28:42_

typedef struct
{
int a;
float b;
}TTT;
int xxxtest(int go, char *mm, float f, TTT ttt)
{
printf("dll step1...\n");
return 0xface;
}

int p0 = (int) drwrap_get_arg(wrapcxt, 0);[OK]
char \* p1 = (char *) drwrap_get_arg(wrapcxt, 1); [OK]
float p2=(float)drwrap_get_arg(wrapcxt, 2); [ERROR, HOW?]
TTT p3 = (TTT)drwrap_get_arg(wrapcxt, 3); [ERROR, HOW?]

How to solve this problem? How to get the arg[2]、arg[3]?

_Original issue: http://code.google.com/p/dynamorio/issues/detail?id=1104_