tree b21a1ae21454785bba12c680451a47bce6b83730
parent 67c1f75d2be5b86f1f125f095a3f3b5fd5a1e104
author Stephen Adams <sra@google.com> 1632803405 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org> 1632803405 +0000

[dart2js] Use Object.assign for populating mixin application

In a subject app, the 'inheritance' phase of the main unit is reduced
from ~40ms to ~20ms.  This improves the pre-main execution after
'CompileScript' from 133ms to 117ms.

Change-Id: I9b426f030c6759274cd84853b99732f43f0968e8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/214361
Commit-Queue: Stephen Adams <sra@google.com>
Reviewed-by: Joshua Litt <joshualitt@google.com>