PATCH to assemble_variable separate section handling

[Jason Merrill]

More fallout from the bss stuff.  In addition to weak symbols, we need to
handle variables that go in separate sections for whatever reason.  So we
need to set DECL_SECTION_NAME appropriately before we check it.

Having fixed this, I ran into another problem; dynamically-initialized
variables in separate sections have been broken for a while, because
output_constant quite reasonably wasn't emitting anything for an
error_mark_node.

Booted and tested i686-pc-linux-gnu.  All applied to trunk; last hunk also
applied to 3.1 branch.

2002-03-15  Jason Merrill  <jason@redhat.com>

	* varasm.c (assemble_variable): Call resolve_unique_section before
	checking DECL_SECTION_NAME.  Use zeros for a decl with DECL_INITIAL
	of error_mark_node.

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