darwin - use switch_to_section instead of asm output.

darwin - use switch_to_section instead of asm output.

We have been emitting two section swiches in the Darwin's
file end function.  This means that varasm is not updated
which could matter if we elect to reorder some of the file
end operations in support of LTO actions.

2019-05-18  Iain Sandoe  <iain@sandoe.co.uk>

	* config/darwin.c (darwin_file_end): Use switch_to_section ()
	instead of direct output of the asm.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@271369 138bc75d-0d04-0410-961f-82ee72b054a4