No, those are separate and irrelevant to the compiler. early-swiftsyntax is what you need a prebuilt Swift compiler for- it builds a swift-syntax parser first that can be linked into the freshly-built Swift compiler- the others are built with the freshly-built Swift compiler at the end.
Hmm, same as before. Try checking the runpath for your freshly-built compiler and see if it references the right directory with the stdlib, something like this:
> readelf -d /home/swift/swift-source/build/buildbot_linux/swift-linux-x86_64/bin/swiftc | grep runpath
0x000000000000001d (RUNPATH) Library runpath: [$ORIGIN/../lib/swift/linux:$ORIGIN/../lib/swift/host]
That means it is looking for the stdlib in /home/swift/swift-source/build/buildbot_linux/swift-linux-x86_64/lib/swift/linux/. If you don't see it there, something is going wrong with the build, so check that runpath and that directory first.
Also, check your CMake log and make sure the bootstrapping mode is set to bootstrap:
-- Bootstrapping: BOOTSTRAPPING