diagnostics: fix build on hosts where unsigned == size_t

diagnostics: fix build on hosts where unsigned == size_t

Looks like I broke the build with r16-3091-gac4e7455a33237 on hosts
where unsigned == size_t.

../../gcc/gcc/diagnostics/dumping.cc:98:1: error: redefinition of ‘void diagnostics::dumping::emit_field(FILE*, int, const char*, T) [with T = unsigned int; FILE = FILE]’
   98 | emit_field<unsigned> (FILE *outfile, int indent,
      | ^~~~~~~~~~~~~~~~~~~~
../../gcc/gcc/diagnostics/dumping.cc:80:1: note: ‘void diagnostics::dumping::emit_field(FILE*, int, const char*, T) [with T = unsigned int; FILE = FILE]’ previously declared here
   80 | emit_field<size_t> (FILE *outfile, int indent,
      | ^~~~~~~~~~~~~~~~~~

Sorry about this.

Should be fixed by the following patch, which avoids templates here
in favor of being explicit about types, avoids the use of "%zi" with
fprintf in various places, and fixes some other minor issues in the
dumping logic that I noticed whilst testing the patch.

gcc/ChangeLog:
	* diagnostics/context.cc (context::dump): Bulletproof against
	m_reference_printer being null.
	* diagnostics/dumping.cc (emit_field<const char *>): Replace
	with...
	(emit_string_field): ...this.
	(emit_field<char *>): Eliminate.
	(emit_field<bool>): Replace with...
	(emit_bool_field): ...this.
	(emit_field<size_t>): Replace with...
	(emit_size_t_field): ...this, and use HOST_SIZE_T_PRINT_DEC rather
	than %zi in fprintf call.
	(emit_field<int>): Replace with...
	(emit_int_field): ...this.
	(emit_field<unsigned>): Replace with...
	(emit_unsigned_field): ...this.
	* diagnostics/dumping.h (emit_field): Replace this template decl
	with...
	(emit_string_field): ...this,
	(emit_bool_field): ...this,
	(emit_size_t_field): ...this,
	(emit_int_field): ...this,
	(emit_unsigned_field): ... and this.
	(DIAGNOSTICS_DUMPING_EMIT_FIELD): Rename to...
	(DIAGNOSTICS_DUMPING_EMIT_BOOL_FIELD): ...this and update for
	above change.
	* diagnostics/file-cache.cc (file_cache_slot::dump): Replace
	emit_field calls with calls that explicitly state the type.  Fix
	type of dump of m_missing_trailing_newline to use bool.
	(file_cache_slot::dump): Use HOST_SIZE_T_PRINT_DEC rather than
	%zi in fprintf call.
	* diagnostics/html-sink.cc (html_generation_options::dump): Update
	for macro renaming.
	* diagnostics/sarif-sink.cc
	(sarif_serialization_format_json::dump): Likewise.
	(sarif_generation_options::dump): Likewise, and for function
	renaming.
	* diagnostics/text-sink.cc (text_sink::dump): Update for macro
	renaming.
	* libgdiagnostics.cc (diagnostic_manager_debug_dump_file): Use
	HOST_SIZE_T_PRINT_DEC rather than %zi in fprintf call.
	* pretty-print.cc: Include "diagnostics/dumping.h".
	(pp_formatted_chunks::dump): Use it.
	(get_url_format_as_string): New.
	(pretty_printer::dump): Use diagnostics::dumping.  Bulletproof
	against m_buffer being null.

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