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: 575.1
- Reference cycles: 452.6
- UOPS_EXECUTED.THREAD: 16.0
- RETIRE_SLOTS: 16.0
- UOPS_MITE: 0.0
- UOPS_MS: 16.0
- UOPS_PORT_0: 4.0
- UOPS_PORT_1: 3.1
- UOPS_PORT_2: 0.5
- UOPS_PORT_3: 0.5
- UOPS_PORT_4: 0.0
- UOPS_PORT_5: 1.8
- UOPS_PORT_6: 6.1
- UOPS_PORT_7: 0.0
- 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: 549.92
- Reference cycles: 464.77
- UOPS_EXECUTED.THREAD: 16.0
- RETIRE_SLOTS: 17.0
- UOPS_MITE: 1.0
- UOPS_MS: 16.0
- UOPS_PORT_0: 3.8
- UOPS_PORT_1: 3.2
- UOPS_PORT_2: 0.5
- UOPS_PORT_3: 0.5
- UOPS_PORT_4: 0.0
- UOPS_PORT_5: 1.6
- UOPS_PORT_6: 6.4
- UOPS_PORT_7: 0.0
- 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: 574.57
- Reference cycles: 452.6
- UOPS_EXECUTED.THREAD: 17.0
- RETIRE_SLOTS: 18.6
- UOPS_MITE: 0.6
- UOPS_MS: 16.0
- UOPS_PORT_0: 3.9
- UOPS_PORT_1: 3.15
- UOPS_PORT_2: 0.5
- UOPS_PORT_3: 0.5
- UOPS_PORT_4: 0.0
- UOPS_PORT_5: 1.6
- UOPS_PORT_6: 7.35
- UOPS_PORT_7: 0.0
- DIV_CYCLES: 0.0
- ILD_STALL.LCP: 0.0
- UOPS_MITE>=1: 0.6