runtime swiss maps

[Leah Stapleton]

Hi,

The code in the map_swiss.go and map_noswiss.go is virtually the same. 

Have the swiss tables been implemented yet? 

https://github.com/golang/go/blob/master/src/runtime/map_swiss.go

https://github.com/golang/go/blob/master/src/runtime/map_noswiss.go

There is nothing in the map_swiss.go files about the empty or deletedSlots discussed here

https://go-review.googlesource.com/c/go/+/426614/12/src/runtime/map.go#59

emptySlot          uint8  = 0b1111_1111
deletedSlot        uint8  = 0b1000_0000

[Keith Randall]

There is an implementation in progress. For the most part it has not been checked in yet.

There is a stack of CLs starting at https://go-review.git.corp.google.com/c/go/+/582415