Stop ngening compat-only DLLs in subfolders #11181
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These DLLs are shipped to these subfolders only for compat with applications that load from them naïvely; MSBuild.exe and VS and applications that use MSBuildLocator should only ever load them from the
bin\
directory directly. So stop spending time ngening them.Notes to January self: look at ngen logs in VS perf tests. Verify