RDRAND (R64) - Throughput and Uops

With 1 independent instruction

With unroll_count=10 and no inner loop

Code:
```
   0:	49 0f c7 f0          	rdrand r8
```
Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 7242.97
- Reference cycles: 6220.0
- UOPS_EXECUTED.THREAD: 14407.27
- RETIRE_SLOTS: 14350.0
- UOPS_MITE: 0.0
- UOPS_MS: 14526.6
- UOPS_PORT_0: 3115.28
- UOPS_PORT_1: 3003.42
- UOPS_PORT_2: 996.0
- UOPS_PORT_3: 1000.7
- UOPS_PORT_4: 17.0
- UOPS_PORT_5: 2984.43
- UOPS_PORT_6: 3283.23
- UOPS_PORT_7: 9.68
- DIV_CYCLES: 0.0
- ILD_STALL.LCP: 0.0
- UOPS_MITE>=1: 0.0

With unroll_count=10, no inner loop, and 1 NOP

Code:

   0:	49 0f c7 f0          	rdrand r8
   4:	90                   	nop

Show nanoBench command
Results:
- Instructions retired: 2.0
- Core cycles: 7240.5
- Reference cycles: 6227.5
- UOPS_EXECUTED.THREAD: 14407.57
- RETIRE_SLOTS: 14351.0
- UOPS_MITE: 1.0
- UOPS_MS: 14526.8
- UOPS_PORT_0: 3115.92
- UOPS_PORT_1: 3002.68
- UOPS_PORT_2: 996.07
- UOPS_PORT_3: 1000.57
- UOPS_PORT_4: 17.0
- UOPS_PORT_5: 2981.3
- UOPS_PORT_6: 3284.57
- UOPS_PORT_7: 9.63
- DIV_CYCLES: 0.0
- ILD_STALL.LCP: 0.0
- UOPS_MITE>=1: 1.0

With loop_count=10 and unroll_count=1

Code:
```
   0:	49 0f c7 f0          	rdrand r8
```
Show nanoBench command
Results:
- Instructions retired: 3.0
- Core cycles: 7241.02
- Reference cycles: 6222.5
- UOPS_EXECUTED.THREAD: 14408.65
- RETIRE_SLOTS: 14351.0
- UOPS_MITE: 1.0
- UOPS_MS: 14526.87
- UOPS_PORT_0: 3116.5
- UOPS_PORT_1: 3002.23
- UOPS_PORT_2: 996.07
- UOPS_PORT_3: 1000.57
- UOPS_PORT_4: 17.0
- UOPS_PORT_5: 2981.42
- UOPS_PORT_6: 3284.62
- UOPS_PORT_7: 9.65
- DIV_CYCLES: 0.0
- ILD_STALL.LCP: 0.0
- UOPS_MITE>=1: 1.0