utils.c (create_var_decl_1): Relax expectations on the PUBLIC_FLAG argument...

utils.c (create_var_decl_1): Relax expectations on the PUBLIC_FLAG argument...

	ada/
	* utils.c (create_var_decl_1): Relax expectations on the PUBLIC_FLAG
	argument, to apply to references in addition to definitions.  Prevent
	setting TREE_STATIC on externals.
	(gnat_pushdecl): Always clear DECL_CONTEXT on public externals.

	testsuite/
	* gnat.dg/tree_static_def.ad[bs]: Support for ...
	* gnat.dg/tree_static_use.adb: New test.
	* gnat.dg/decl_ctx_def.ads: Support for ...
	* gnat.dg/decl_ctx_use.ad[bs]: New test.

From-SVN: r137923