Added: started support for x86 80bit floating point.
Changed: aggregates passed by value now use the llvm 'byval' parameter attribute, also lays ground work for
using other attributes.
Changed: eliminated a lot more std::vectorS, these showed up pretty much at the top when profiling!
Changed: performed other misc. cleanups.
Changed: halt expression now call the new llvm trap intrinsic instead of an assert(0).
Changed: dstress suite now passes -O0 by default, this only eliminates unreferenced globals, which speeds up
linking quite a bit.
Added some comments and cleaned up CallExp::toElem a tiny bit.
Fixed: struct literals always reported inplace assignment even if they allocated a temporary.
Fixed: passing stuff to a D-style vararg which did inplace assignment was generated suboptimal code.
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.
