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libcpp/

	* include/internal.h (_cpp_remaining_tokens_num_in_context): Take the
	context to act upon.
	* lex.c (_cpp_remaining_tokens_num_in_context): Likewise.  Update
	comment.
	(cpp_token_from_context_at): Likewise.
	(cpp_peek_token): Use the context to peek tokens from.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@180328 138bc75d-0d04-0410-961f-82ee72b054a4