They now have llvm and gcc toolchains now, so imagine they are planning to switch (although it is still GNU ld/gold even with llvm), although that is for usersp

They now have llvm and gcc toolchains now, so imagine they are planning to switch (although it is still GNU ld/gold even with llvm), although that is for userspace, the kernel is not really part of Android and would still be gcc compiled for now.