make TS_IDENTIFIER be a substructure of TS_TYPED
gcc/
	* tree.h (struct tree_identifier): Inherit from tree_typed, not
	tree_common.
	(HT_IDENT_TO_GCC_IDENT): Adjust for said change.
	* tree.c (initialize_tree_contains_struct): Mark TS_IDENTIFIER as
	TS_BASE instead of TS_COMMON.
	* varasm.c (assemble_name): Remove assert.

gcc/c-family/
	* c-common.h (struct c_common_identifier): Inherit from tree_typed,
	not tree_common.

From-SVN: r174286