Code-completion performance improvement via server-side filtering

[blangmuir (Ben Langmuir)]

Are you perhaps trying to build a full toolchain? I see someone else ran into this:

Swift build failure with ninja and Xcode 11.5 default toolchain when building XCTest -- compiler mismatch?

Hi everybody, A couple of days ago I stopped being able to build swift, which is weird. The configuration is MacOS 10.5.5 with Xcode 11.5 (Version 11.5 (11E608c)) and the default toolchain (although I have had the same thing happen with other toolchains, and swift also won't build in the Big Sur partition with the Xcode beta but I get different errors, still maybe related to XCText, but that' s for another day.) I ran update-checkout with everything in master (or swift/master for llvm). Then …