JRCXZ (Rel8) - Throughput and Uops

With RCX=0

With unroll_count=500 and no inner loop

Code:
```
   0:	e3 00                	jrcxz  0x2
```
Init:
```
mov RCX, 0
```
Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 8.45
- Reference cycles: 8.67
- UOPS_RETIRED.ALL: 2.0
- UOPS_MS: 2.0

With loop_count=1000 and unroll_count=10

Code:
```
   0:	e3 00                	jrcxz  0x2
```
Init:
```
mov RCX, 0
```
Show nanoBench command
Results:
- Instructions retired: 1.2
- Core cycles: 8.88
- Reference cycles: 9.1
- UOPS_RETIRED.ALL: 2.2
- UOPS_MS: 2.0

With loop_count=100 and unroll_count=100

Code:
```
   0:	e3 00                	jrcxz  0x2
```
Init:
```
mov RCX, 0
```
Show nanoBench command
Results:
- Instructions retired: 1.02
- Core cycles: 8.32
- Reference cycles: 8.52
- UOPS_RETIRED.ALL: 2.02
- UOPS_MS: 2.0

With RCX=1

With unroll_count=500 and no inner loop

Code:
```
   0:	e3 00                	jrcxz  0x2
```
Init:
```
mov RCX, 1
```
Show nanoBench command
Results:
- Instructions retired: 1.0
- Core cycles: 22.0
- Reference cycles: 22.5
- UOPS_RETIRED.ALL: 2.0
- UOPS_MS: 2.0

With loop_count=1000 and unroll_count=10

Code:
```
   0:	e3 00                	jrcxz  0x2
```
Init:
```
mov RCX, 1
```
Show nanoBench command
Results:
- Instructions retired: 1.2
- Core cycles: 22.49
- Reference cycles: 23.04
- UOPS_RETIRED.ALL: 2.2
- UOPS_MS: 2.0

With loop_count=100 and unroll_count=100

Code:
```
   0:	e3 00                	jrcxz  0x2
```
Init:
```
mov RCX, 1
```
Show nanoBench command
Results:
- Instructions retired: 1.02
- Core cycles: 22.03
- Reference cycles: 22.56
- UOPS_RETIRED.ALL: 2.02
- UOPS_MS: 2.0