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: 1548.77
- Reference cycles: 513.05
- UOPS_EXECUTED.THREAD: 56.4
- RETIRE_SLOTS: 53.98
- UOPS_MITE: 0.0
- UOPS_MS: 62.2
- UOPS_PORT_0: 10.07
- UOPS_PORT_1: 18.03
- UOPS_PORT_5: 9.9
- UOPS_PORT_6: 17.4
- UOPS_PORT_23: 0.0
- UOPS_PORT_49: 0.0
- UOPS_PORT_78: 1.0
- 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: 1548.38
- Reference cycles: 512.02
- UOPS_EXECUTED.THREAD: 56.38
- RETIRE_SLOTS: 54.97
- UOPS_MITE: 1.8
- UOPS_MS: 62.2
- UOPS_PORT_0: 9.62
- UOPS_PORT_1: 18.38
- UOPS_PORT_5: 10.0
- UOPS_PORT_6: 17.4
- UOPS_PORT_23: 0.0
- UOPS_PORT_49: 0.0
- UOPS_PORT_78: 1.0
- 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: 1548.77
- Reference cycles: 511.5
- UOPS_EXECUTED.THREAD: 58.42
- RETIRE_SLOTS: 55.72
- UOPS_MITE: 1.88
- UOPS_MS: 62.2
- UOPS_PORT_0: 9.67
- UOPS_PORT_1: 18.5
- UOPS_PORT_5: 10.7
- UOPS_PORT_6: 18.4
- UOPS_PORT_23: 0.0
- UOPS_PORT_49: 0.0
- UOPS_PORT_78: 1.0
- DIV_CYCLES: 0.0
- ILD_STALL.LCP: 0.0
- UOPS_MITE>=1: 1.0