I'm seeing a significant performance regression running some JavaScript 
workloads in an application that embeds V8. There isn't much going on in 
terms of native code integration in this workload, it's mostly doing some 
CryptoJS stuff.

Doing a `git bisect` I've isolated the change to this 
commit: 
https://chromium.googlesource.com/v8/v8/+/0ff080d1f7f6b1a0fdaedc6e150ac93a8ce962ec

I'm wondering if anyone has any thoughts on this.
- Is anyone else seeing this performance change?
- Would a performance regression have been noticed in regular V8 release 
testing?
- Does anyone have any thoughts on how to mitigate the performance impact? 
The changes to the map space in that commit don't appear to have build 
options to control them, that I can see.

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