pretty-print: naming cleanups

This patch is a followup to r15-3311-ge31b6176996567 making some
cleanups to pretty-printing to reflect those changes:
- renaming "chunk_info" to "pp_formatted_chunks"
- renaming "cur_chunk_array" to "m_cur_fomatted_chunks"
- rewording/clarifying comments
and taking the opportunity to add a "m_" prefix to all fields of
output_buffer.

No functional change intended.

gcc/analyzer/ChangeLog:
	* analyzer-logging.cc (logger::logger): Prefix all output_buffer
	fields with "m_".

gcc/c-family/ChangeLog:
	* c-ada-spec.cc (dump_ada_node): Prefix all output_buffer fields
	with "m_".
	* c-pretty-print.cc (pp_c_integer_constant): Likewise.
	(pp_c_integer_constant): Likewise.
	(pp_c_floating_constant): Likewise.
	(pp_c_fixed_constant): Likewise.

gcc/c/ChangeLog:
	* c-objc-common.cc (print_type): Prefix all output_buffer fields
	with "m_".

gcc/cp/ChangeLog:
	* error.cc (type_to_string): Prefix all output_buffer fields with
	"m_".
	(append_formatted_chunk): Likewise.  Rename "chunk_info" to
	"pp_formatted_chunks" and field cur_chunk_array with
	m_cur_formatted_chunks.

gcc/fortran/ChangeLog:
	* error.cc (gfc_move_error_buffer_from_to): Prefix all
	output_buffer fields with "m_".
	(gfc_diagnostics_init): Likewise.

gcc/ChangeLog:
	* diagnostic.cc (diagnostic_set_caret_max_width): Prefix all
	output_buffer fields with "m_".
	* dumpfile.cc (emit_any_pending_textual_chunks): Likewise.
	(emit_any_pending_textual_chunks): Likewise.
	* gimple-pretty-print.cc (gimple_dump_bb_buff): Likewise.
	* json.cc (value::dump): Likewise.
	* pretty-print-format-impl.h (class chunk_info): Rename to...
	(class pp_formatted_chunks): ...this.  Add friend
	class output_buffer.  Update comment near end of decl to show
	the pp_formatted_chunks instance on the chunk_obstack.
	(pp_formatted_chunks::pop_from_output_buffer): Delete decl.
	(pp_formatted_chunks::on_begin_quote): Delete decl that should
	have been removed in r15-3311-ge31b6176996567.
	(pp_formatted_chunks::on_end_quote): Likewise.
	(pp_formatted_chunks::m_prev): Update for renaming.
	* pretty-print.cc (output_buffer::output_buffer): Prefix all
	fields with "m_".  Rename "cur_chunk_array" to
	"m_cur_formatted_chunks".
	(output_buffer::~output_buffer): Prefix all fields with "m_".
	(output_buffer::push_formatted_chunks): New.
	(output_buffer::pop_formatted_chunks): New.
	(pp_write_text_to_stream): Prefix all output_buffer fields with
	"m_".
	(pp_write_text_as_dot_label_to_stream): Likewise.
	(pp_write_text_as_html_like_dot_to_stream): Likewise.
	(chunk_info::append_formatted_chunk): Rename to...
	(pp_formatted_chunks::append_formatted_chunk): ...this.
	(chunk_info::pop_from_output_buffer): Delete.
	(pretty_printer::format): Update leading comment to mention
	pushing pp_formatted_chunks, and to reflect changes in
	r15-3311-ge31b6176996567.  Prefix all output_buffer fields with
	"m_".
	(pp_output_formatted_text): Update leading comment to mention
	popping a pp_formatted_chunks, and to reflect the changes in
	r15-3311-ge31b6176996567.  Prefix all output_buffer fields with
	"m_" and rename "cur_chunk_array" to "m_cur_formatted_chunks".
	Replace call to chunk_info::pop_from_output_buffer with a call to
	output_buffer::pop_formatted_chunks.
	(pp_flush): Prefix all output_buffer fields with "m_".
	(pp_really_flush): Likewise.
	(pp_clear_output_area): Likewise.
	(pp_append_text): Likewise.
	(pretty_printer::remaining_character_count_for_line): Likewise.
	(pp_newline): Likewise.
	(pp_character): Likewise.
	(pp_markup::context::push_back_any_text): Likewise.
	* pretty-print.h (class chunk_info): Rename to...
	(class pp_formatted_chunks): ...this.
	(class output_buffer): Delete unimplemented rule-of-5 members.
	(output_buffer::push_formatted_chunks): New decl.
	(output_buffer::pop_formatted_chunks): New decl.
	(output_buffer::formatted_obstack): Rename to...
	(output_buffer::m_formatted_obstack): ...this.
	(output_buffer::chunk_obstack): Rename to...
	(output_buffer::m_chunk_obstack): ...this.
	(output_buffer::obstack): Rename to...
	(output_buffer::m_obstack): ...this.
	(output_buffer::cur_chunk_array): Rename to...
	(output_buffer::m_cur_formatted_chunks): ...this.
	(output_buffer::stream): Rename to...
	(output_buffer::m_stream): ...this.
	(output_buffer::line_length): Rename to...
	(output_buffer::m_line_length): ...this.
	(output_buffer::digit_buffer): Rename to...
	(output_buffer::m_digit_buffer): ...this.
	(output_buffer::flush_p): Rename to...
	(output_buffer::m_flush_p): ...this.
	(output_buffer_formatted_text): Prefix all output_buffer fields
	with "m_".
	(output_buffer_append_r): Likewise.
	(output_buffer_last_position_in_text): Likewise.
	(pretty_printer::set_output_stream): Likewise.
	(pp_scalar): Likewise.
	(pp_wide_int): Likewise.
	* tree-pretty-print.cc (dump_generic_node): Likewise.
	(dump_generic_node): Likewise.
	(pp_double_int): Likewise.

Signed-off-by: David Malcolm <dmalcolm@redhat.com>