re PR target/27789 (attribute handling fallout from DECL_INITIAL changes)

re PR target/27789 (attribute handling fallout from DECL_INITIAL changes)

	PR target/27789
	* config/i386/winnt.c (ix86_handle_selectany_attribute): Move check
	for initialization and setting of one_only flag to ...
	(i386_pe_encode_section_info): ...here.
	(i386_pe_dllimport_p): Check for DECL_DLLIMPORT_P also.
	Recheck that the symbol has not been defined.

cp
	* decl.c (start_decl): Check that dllimports are not initialized.

testsuite
	* g++.dg/ext/dllimport4.C. Add more tests for invalid
	initialization.

From-SVN: r114927