diagnostics: fix overload of emit_diagnostic [PR117109]

diagnostics: fix overload of emit_diagnostic [PR117109]

I accidentally broke "make gcc.pot" in r15-4081 by adding
a member function diagnostic_context::emit_diagnostic with a
gmsgid in a different position to the existing emit_diagnostic
functions, which exgettext's parser can't handle.

Fixed thusly.

gcc/ChangeLog:
	PR bootstrap/117109
	* diagnostic-format-sarif.cc
	(diagnostic_output_format_init_sarif_file): Rename
	diagnostic_context::emit_diagnostic to
	diagnostic_context::emit_diagnostic_with_group.
	* diagnostic.cc (diagnostic_context::emit_diagnostic): Rename
	to...
	(diagnostic_context::emit_diagnostic_with_group): ...this.
	(diagnostic_context::emit_diagnostic_va): Rename to...
	(diagnostic_context::emit_diagnostic_with_group_va): ...this.
	* diagnostic.h (diagnostic_context::emit_diagnostic): Rename to...
	(diagnostic_context::emit_diagnostic_with_group): ...this.
	(diagnostic_context::emit_diagnostic_va): Rename to...
	(diagnostic_context::emit_diagnostic_with_group_va): ...this.

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