Made runtime to compile to native by default. Changed linker.cpp to link in native runtime library.
This change requires a runtime rebuild as well as a new symbolic link in lib/ to tango/lib/libtango-base-llvmdc-native.a.
Fixed: the tango/lib/compiler/llvmdc/llvmdc.mak makefile was a bit incorrect.
Changed: the basic gc is now the default.
Changed: renamed a few temporary names in the LLVM IR output.
Changed: removed the crappy realloc based dynamic memory runtime and started moving over to DMD style runtime support, part of moving to real GC.
Fixed: dynamic arrays now use GC runtime for allocating memory.
Fixed: new expression now use GC for allocating memory.
Changed: revamped the dynamic array support routines related to dynamic memory.
Fixed: assertions no longer create exsessive allocas.
Changed: misc. minor cleanups.
