[Darwin, machopic 1/n] Consider visibility in indirections.

[Darwin, machopic 1/n] Consider visibility in indirections.

For weak, hidden vars the indirection should just be as normal, that
is that the indirections for such symbols should appear in the non-lazy
symbol pointers table, not in the .data section.

gcc/ChangeLog:

2019-10-07  Iain Sandoe  <iain@sandoe.co.uk>

	* config/darwin.c (machopic_output_indirection): Don't put
	hidden symbol indirections into the .data section, use the
	non-lazy symbol pointers section as normal.
	(darwin_encode_section_info): Record if a symbol is hidden.
	* config/darwin.h (MACHO_SYMBOL_FLAG_HIDDEN_VIS): New.
	(MACHO_SYMBOL_HIDDEN_VIS_P): New.

From-SVN: r276675