Darwin: Partial reversion of r14-3648 (Inits Section).

Darwin: Partial reversion of r14-3648 (Inits Section).

Although the Darwin ABI places both hot and cold partitions in the same
section (the linker can partition by name), this does not work with the
current dwarf2out implementation.

Since we do see global initialization code getting hot/cold splits, this
patch places the cold parts into text_cold, and keeps the hot part in
the correct Init section per ABI.

TODO: figure out a way to allow us to match the ABI fully.

gcc/ChangeLog:

	* config/darwin.cc (darwin_function_section): Place unlikely
	executed global init code into the standard cold section.

Signed-off-by: Iain Sandoe <iain@sandoe.co.uk>