Implement _section macro to allow users to place objects in specific sections.
Implement _address macro to allow users to place objects at a particular address.
Placing objects at a memory address:
crate a unique section name from varname, address, object type and put that section at specified address. Mark this section a full (size = banksize) so that other objects do not compete for it while placing objects to sections in AsmPrinter.
llvm-svn: 74822
Use only the *dirname* of the pathname given to -o, so that -o can still be used
to name the output executable. This is more like what GCC 4.5 does.
llvm-svn: 74790
