Simple string test
Make llvmver() return an integer (major*10+minor), implement LLVM 3.5 addrspacecast for addrspace(1)s.
Mark __popFrameInfo as internal, so it gets declared as fastcc and can be reused in dg hack
Disable fpucw use pending investigation
Simplify tuple access logic; workaround breaking fallout from that change. (TODO: remove lvize entirely) (TODO: tmpize_maybe with a withtemp should if possible  the result into an existing withtemp if called with one)