C code imported using includec is now optimized before it is linked into the Terra code.
terralib.linklibrary can now also load an llvm bitcode file:

 terralib.linklibrary("foo.bc")

(You still need to declare the symbols using a C header file and terralib.includec).

Since foo.bc is llvm bitcode Terra can inline any code it contains. However,
since it is bitcode Terra must compile it, which can add to startup costs.