What is the difference between a stable and unstable map?

Context: I'm trying to understand this line of 
code 
https://cs.chromium.org/chromium/src/v8/src/compiler/js-native-context-specialization.cc?l=3227&rcl=4c53f9a51444393133ff303952f1296603d44ab7
 
but can't seem to find any documentation about stable maps. Comments and 
diffs are sparse on the subject as well.

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