Surely the quote from Android 3.0 Preview Platform Highlights (
Android 3.0 Platform Highlights | Android Developers) would suggest otherwise??
"
Support for multicore processor architectures
Android 3.0 is the first version of the platform designed to run on either
single or multicore processor architectures. A variety of changes in the Dalvik VM, Bionic library, and elsewhere add support for symmetric multiprocessing in multicore environments. These optimizations can benefit all applications, even those that are single-threaded. For example, with two active cores, a single-threaded application might still see a performance boost if the Dalvik garbage collector runs on the second core. The system will arrange for this automatically."
-OG.