* src/vm/jit/powerpc/darwin/md-abi.h (REG_FA0, REG_FA1): Added.

* src/vm/jit/powerpc/darwin/md-abi.h (REG_FA0, REG_FA1): Added.
(REG_A0_A1_PACKED, REG_A2_A3_PACKED): Likewise.

* src/vm/jit/powerpc/darwin/md-os.c [ENABLE_THREADS]
(threads/native/threads.h): Added.
(md_signal_handler_sigsegv): Changed for hardware-exceptions.
(md_signal_handler_sigtrap): New function.

* src/vm/jit/powerpc/darwin/md-abi.c (vm/descriptor.h): Changed to
vmcore/descriptor.h.
(regs): Renamed to abi_registers_integer_name.
(abi_registers_integer_argument): Added.
(abi_registers_integer_saved): Likewise.
(abi_registers_integer_temporary): Likewise.
(abi_registers_float_argument): Likewise.
(abi_registers_float_saved): Likewise.
(abi_registers_float_temporary): Likewise.
(md_param_alloc): Use new register arrays.
(md_param_alloc_native): New function.