casting warnings. Implement _jit_gen_redirector(...). Fix
JIT_CDECL_WORD_REG_PARAMS to use the correct parameter
registers. Add some stack push and pop instructions.
in jit/jit-rules-alpha.c.
There is enough done on the alpha port to compile the following function
"void func(void) { return; }" and call it 1,000,000 times without anything
crashing. jit_dump_function shows a properly generated prolog and epilog.