BUG: Illegal instruction: 4 on mid2010 Mac
#### Code Sample, a copy-pastable example

```python
Python 3.7.7 (default, Mar 26 2020, 10:32:53) 
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas as pd
Illegal instruction: 4
(Pandas) iMac:~ laurent$ sysctl -a | grep machdep.cpu.features
machdep.cpu.features: FPU VME DE PSE TSC MSR PAE MCE CX8 APIC SEP MTRR PGE MCA CMOV PAT PSE36 CLFSH DS ACPI MMX FXSR SSE SSE2 SS HTT TM PBE SSE3 DTES64 MON DSCPL VMX SMX EST TM2 SSSE3 CX16 TPR PDCM SSE4.1 SSE4.2 POPCNT
(Pandas) iMac:~ laurent$ conda list numpy
# packages in environment at /Users/laurent/opt/anaconda3/envs/Pandas:
#
# Name                    Version                   Build  Channel
numpy                     1.18.1           py37h7241aed_0  
numpy-base                1.18.1           py37h6575580_1  
```

#### Problem description

With a mid 2010 Mac, OSX 10.13.6 (High Sierra)

  ```
Identifiant du modèle :	iMac11,3
  Nom du processeur :	Intel Core i5
  Vitesse du processeur :	2,8 GHz
  Nombre de processeurs :	1
  Nombre total de cœurs :	4
  Cache de niveau 2 (par cœur) :	256 Ko
  Cache de niveau 3 :	8 Mo
  Mémoire :	16 Go
  Version de la ROM de démarrage :	99.0.0.0.0
  Version SMC (système) :	1.59f2
```

`import pandas as pd`, crashes with `Illegal instruction: 4`

Old Mac doesn't support VFX, as it is not displayed in sysctl -a | grep machdep.cpu.features output.

This problem is also mentioned here : 

https://github.com/conda/conda/issues/9678
https://github.com/das-developers/condaCDF/issues/1

and as it was detected when trying to run inside Anaconda/jupyter, the work in progress to solve is described here : 

https://discourse.jupyter.org/t/osx-10-13-6-kernelrestarter-restarting-kernel/3965/8
