Salting garlic at the start of a recipe
I would generally advise against salting garlic before sautéing, but it depends on your use and style of cooking. Salting garlic is a French technique. It draws out moisture and makes it more difficult to brown (which may be what you're after). 

Garlic is difficult to get right as people often over-cook it causing it to be bitter. If you're cooking garlic by itself, start with it in the cold oil and heat them together. If you are sweating the garlic and don't intend to brown it, then salting is fine and may help. 

I sometimes use kosher salt when puréeing garlic with a chef's knife as this helps pulverize the garlic. A lot of your technique will depend on the recipe and how pungent you want the garlic. The more you cut, mince, or grind it (before cooking), the more caustic flavor you will get as more allicin is created. Cooking the garlic destroys the alliinase enzyme so no further allicin will be created once cooked.