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: 13829.85
- Reference cycles: 8267.25
- UOPS_EXECUTED.THREAD: 80.1
- RETIRE_SLOTS: 64.53
- UOPS_MITE: 0.0
- UOPS_MS: 91.2
- UOPS_PORT_0: 8.0
- UOPS_PORT_1: 13.9
- UOPS_PORT_5: 12.0
- UOPS_PORT_6: 23.32
- UOPS_PORT_23: 1.0
- UOPS_PORT_49: 9.33
- UOPS_PORT_78: 12.33
- 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: 13817.95
- Reference cycles: 8258.73
- UOPS_EXECUTED.THREAD: 80.05
- RETIRE_SLOTS: 65.6
- UOPS_MITE: 1.17
- UOPS_MS: 91.2
- UOPS_PORT_0: 8.0
- UOPS_PORT_1: 13.9
- UOPS_PORT_5: 12.0
- UOPS_PORT_6: 23.25
- UOPS_PORT_23: 1.0
- UOPS_PORT_49: 9.28
- UOPS_PORT_78: 12.28
- DIV_CYCLES: 0.0
- ILD_STALL.LCP: 0.0
- UOPS_MITE>=1: 1.0

With loop_count=2 and unroll_count=1

Code:
```
   0:	49 0f c7 f0          	rdrand r8
```
Show nanoBench command
Results:
- Instructions retired: 3.0
- Core cycles: 13541.75
- Reference cycles: 8096.92
- UOPS_EXECUTED.THREAD: 80.75
- RETIRE_SLOTS: 64.33
- UOPS_MITE: 1.09
- UOPS_MS: 92.0
- UOPS_PORT_0: 8.0
- UOPS_PORT_1: 14.0
- UOPS_PORT_5: 12.0
- UOPS_PORT_6: 23.83
- UOPS_PORT_23: 1.0
- UOPS_PORT_49: 9.17
- UOPS_PORT_78: 12.17
- DIV_CYCLES: 0.0
- ILD_STALL.LCP: 0.0
- UOPS_MITE>=1: 1.0