diagnostics: introduce a "gcc/diagnostics" subdirectory

The "gcc" subdirectory of our source tree currently contains a total
of almost 1000 .cc and .h files, enough to hit rate-limiting in some
git web UIs, and obscuring the logical relationships between subsystems.

In r16-2211-ga5d9debedd2f46 I started introducing a
"namespace diagnostics" so it makes sense to move such code
into a new "gcc/diagnostics" subdirectory.

My intent is for the "diagnostics" namespace/directory to contain
shared parts of the diagnostics code that are in libcommon, in
particular which don't have knowledge of trees.

This patch begins moving of the existing code within
"namespace diagnostics" into a new "gcc/diagnostics" subdirectory.

No functional change intended.

  renamed:    gcc/diagnostic-digraphs.cc -> gcc/diagnostics/digraphs.cc
  renamed:    gcc/diagnostic-digraphs.h -> gcc/diagnostics/digraphs.h
  renamed:    gcc/diagnostic-state-to-dot.cc -> gcc/diagnostics/state-graphs-to-dot.cc
  renamed:    gcc/diagnostic-state-graphs.cc -> gcc/diagnostics/state-graphs.cc
  renamed:    gcc/diagnostic-state-graphs.h -> gcc/diagnostics/state-graphs.h

contrib/ChangeLog:
	* gcc.doxy (INPUT): Add gcc/diagnostics subdir.

gcc/ChangeLog:
	* Makefile.in (OBJS-libcommon): Rename diagnostic-digraphs.o to
	diagnostics/digraphs.o.  Rename diagnostic-state-graphs.o to
	diagnostics/state-graphs.o.  Rename diagnostic-state-to-dot.o to
	diagnostics/state-graphs-to-dot.o.
	(PLUGIN_HEADERS): Add $(srcdir)/diagnostics/*.h.
	(install-plugin:): Likewise.
	* configure: Regenerate.
	* configure.ac (gccdepdir): Add "diagnostics" to directories.
	* diagnostic-format-html.cc: Update #includes for move of
	"diagnostic-digraphs.h" to "diagnostics/digraphs.h" and of
	move of "diagnostic-state-graphs.h" to
	"diagnostics/state-graphs.h".
	* diagnostic-format-sarif.cc: Likewise.
	* diagnostic-path.cc: Likewise for state-graphs.h
	* diagnostic-digraphs.cc: Move...
	* diagnostics/digraphs.cc: ...to here.  Update #include
	for renaming of digraphs.h.
	(selftest::diagnostic_digraphs_cc_tests): Rename to...
	(selftest::diagnostics_digraphs_cc_tests): ...this.
	* diagnostic-digraphs.h: Move...
	* diagnostics/digraphs.h: ...to here, updating header guard.
	* diagnostic-state-to-dot.cc: Move...
	* diagnostics/state-graphs-to-dot.cc: ...to here.  Update #include
	of state-graphs.h.
	* diagnostic-state-graphs.cc: Move...
	* diagnostics/state-graphs.cc: ...to here.  Update #include
	of state-graphs.h.
	(selftest::diagnostic_state_graphs_cc_tests): Rename...
	(selftest::diagnostics_state_graphs_cc_tests): ...to this.
	* diagnostic-state-graphs.h: Move...
	* diagnostics/state-graphs.h: ...to here, updating header guard.
	* libgdiagnostics.cc: Update #includes for move of
	"diagnostic-digraphs.h" to "diagnostics/digraphs.h" and of
	move of "diagnostic-state-graphs.h" to
	"diagnostics/state-graphs.h".
	* selftest-run-tests.cc (selftest::run_tests): Update for
	function renamings that reflect file renamings.
	* selftest.h (selftest::diagnostic_digraphs_cc_tests): Rename
	to...
	(selftest::diagnostics_digraphs_cc_tests): ...this.
	(selftest::diagnostic_state_graphs_cc_tests): Rename...
	(selftest::diagnostics_state_graphs_cc_tests): ...to this.

gcc/analyzer/ChangeLog:
	* ana-state-to-diagnostic-state.cc: Update #include for move of
	"diagnostic-state-graphs.h" to "diagnostics/state-graphs.h".
	* ana-state-to-diagnostic-state.h: Likewise.
	* checker-event.cc: Likewise.
	* checker-event.h: Update #include for move of
	"diagnostic-digraphs.h" to "diagnostics/digraphs.h".
	* program-state.cc: : Update #include for move of
	"diagnostic-state-graphs.h" to "diagnostics/state-graphs.h".

gcc/testsuite/ChangeLog:
	* gcc.dg/plugin/diagnostic_plugin_test_graphs.cc: Update #include
	for move of "diagnostic-digraphs.h" to "diagnostics/digraphs.h".

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

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