perf tools: Use just forward declarations for struct thread where possible

Removing various instances of unnecessary includes, reducing the maze of
header dependencies.

Link: http://lkml.kernel.org/n/tip-hwu6eyuok9pc57alookyzmsf@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/arm/util/unwind-libdw.c

 #include <elfutils/libdwfl.h>
 #include "../../util/unwind-libdw.h"
 #include "../../util/perf_regs.h"
+#include "../../util/event.h"
 
 bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
 {

tools/perf/arch/x86/util/unwind-libdw.c

 #include <elfutils/libdwfl.h>
 #include "../../util/unwind-libdw.h"
 #include "../../util/perf_regs.h"
+#include "../../util/event.h"
 
 bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
 {

tools/perf/builtin-c2c.c

@@ -32,6 +32,7 @@
 #include <asm/bug.h>
 #include "ui/browsers/hists.h"
 #include "evlist.h"
+#include "thread.h"
 
 struct c2c_hists {
 	struct hists		hists;

tools/perf/builtin-inject.c

@@ -18,6 +18,7 @@
 #include "util/data.h"
 #include "util/auxtrace.h"
 #include "util/jit.h"
+#include "util/thread.h"
 
 #include <subcmd/parse-options.h>
 

tools/perf/builtin-mem.c

@@ -12,6 +12,7 @@
 #include "util/data.h"
 #include "util/mem-events.h"
 #include "util/debug.h"
+#include "util/symbol.h"
 
 #define MEM_OPERATION_LOAD	0x1
 #define MEM_OPERATION_STORE	0x2

tools/perf/builtin-timechart.c

@@ -29,6 +29,7 @@
 #include <linux/rbtree.h>
 #include <linux/time64.h>
 #include "util/symbol.h"
+#include "util/thread.h"
 #include "util/callchain.h"
 
 #include "perf.h"

tools/perf/ui/browsers/hists.c

@@ -14,6 +14,7 @@
 #include "../../util/sort.h"
 #include "../../util/util.h"
 #include "../../util/top.h"
+#include "../../util/thread.h"
 #include "../../arch/common.h"
 
 #include "../browsers/hists.h"

tools/perf/ui/stdio/hist.c

@@ -6,6 +6,7 @@
 #include "../../util/evsel.h"
 #include "../../util/srcline.h"
 #include "../../util/string2.h"
+#include "../../util/thread.h"
 #include "../../util/sane_ctype.h"
 
 static size_t callchain__fprintf_left_margin(FILE *fp, int left_margin)

tools/perf/util/build-id.c

@@ -15,6 +15,7 @@
 #include "build-id.h"
 #include "event.h"
 #include "symbol.h"
+#include "thread.h"
 #include <linux/kernel.h>
 #include "debug.h"
 #include "session.h"

tools/perf/util/hist.c

@@ -9,6 +9,7 @@
 #include "evsel.h"
 #include "annotate.h"
 #include "srcline.h"
+#include "thread.h"
 #include "ui/progress.h"
 #include <errno.h>
 #include <math.h>

tools/perf/util/session.c

@@ -19,6 +19,7 @@
 #include "perf_regs.h"
 #include "asm/bug.h"
 #include "auxtrace.h"
+#include "thread.h"
 #include "thread-stack.h"
 #include "stat.h"
 

tools/perf/util/session.h

@@ -5,8 +5,6 @@
 #include "event.h"
 #include "header.h"
 #include "machine.h"
-#include "symbol.h"
-#include "thread.h"
 #include "data.h"
 #include "ordered-events.h"
 #include <linux/kernel.h>
@@ -14,6 +12,7 @@
 #include <linux/perf_event.h>
 
 struct ip_callchain;
+struct symbol;
 struct thread;
 
 struct auxtrace;

tools/perf/util/sort.c

@@ -6,6 +6,7 @@
 #include "hist.h"
 #include "comm.h"
 #include "symbol.h"
+#include "thread.h"
 #include "evsel.h"
 #include "evlist.h"
 #include "strlist.h"

tools/perf/util/sort.h

@@ -21,7 +21,8 @@
 #include "parse-events.h"
 #include "hist.h"
 #include "srcline.h"
-#include "thread.h"
+
+struct thread;
 
 extern regex_t parent_regex;
 extern const char *sort_order;

tools/perf/util/unwind-libdw.h

@@ -2,10 +2,12 @@
 #define __PERF_UNWIND_LIBDW_H
 
 #include <elfutils/libdwfl.h>
-#include "event.h"
-#include "thread.h"
 #include "unwind.h"
 
+struct machine;
+struct perf_sample;
+struct thread;
+
 bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg);
 
 struct unwind_info {