[svn r59] Added support for C-style variadic functions. Currently only works on x86, x86-64 va_arg is broken in LLVM 2.1. PPC and PPC64 unknown. Updates to runtime. Rebuild!

module bug2;
struct Vec { Vec barf() { return Vec(); } }
class test { this(Vec whee) { } }
void main() { Vec whee; new test(whee.barf()); }