Fix bug with grouping sections.

Fix bug with grouping sections.

The fix for PR 15370 did not correctly check all patterns in a group,
but instead threw all unassigned sections into the group. This patch
fixes that.

2016-06-23  Cary Coutant  <ccoutant@gmail.com>
	    Igor Kudrin  <ikudrin@accesssoftek.com>

gold/
	PR gold/15370
	* script-sections.cc
	(Output_section_element_input::set_section_addresses): Keep bin_count
	separate from input_pattern_count.
	* testsuite/script_test_12.t: Add another section .x4.
	* testsuite/script_test_12i.t: Likewise.
	* testsuite/script_test_12a.c: Likewise.
	* testsuite/script_test_12b.c: Likewise.