[lto][patch] Fix missing vtables. Some global variables were not being finalized.

[Bill Maddox]

This patch fixes certain cases in which a C++ program fails to link
with -flto-single
because the code includes a reference to a vtable that was not
emitted.  This was
due to failure to invoke rest_of_decl_compilation on the
compiler-generated vtable
VAR_DECLs.   For most globals, this occurs in lto_main, which expects
to find the
VAR_DECLs in array lto_global_var_decls.  VAR_DECLs are added to this array
in lto_symtab_merge_decl, which was not being called.

gcc:

	* lto-function-in.c (input_var_decl): Use decl_function_context
	rather than DECL_FILE_SCOPE_P to determine whether a VAR_DECL
	is global.

gcc/lto:

	* lto-symtab.c (lto_symtab_merge_decl): Add comment.

gcc/testsuite/g++.dg/other:

	* g++.dg/other/lto3.C:  New test.

--Bill
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