translate the FPU instruction pointer

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on March 13, 2012 00:01:59_

the FPU status includes an instruction pointer selector and offset. DR today does not translate it from the code cache to the corresponding app address.

sample code from Jun Koi:

#include

int main()
{
int edx, ecx;

```
__asm__ __volatile__ (
"x: fldz;" \
"movl $x, %%ecx;" \
"push %%edx;" \
"fnstenv -0xc(%%esp);" \
"pop %%edx;" : "=d" (edx), "=c" (ecx) : : "memory");

if (ecx == edx)
printf("FNSTENV is correctly handled\n");
else
printf("FNSTENV is incorrectly handled: edx = %x, ecx = %x\n", edx, ecx);

return 0;
```

}

_Original issue: http://code.google.com/p/dynamorio/issues/detail?id=698_