Vendor valgrind headers

This is encouraged according to https://valgrind.org/docs/manual/manual-core-adv.html#manual-core-adv.clientreq

third_party/valgrind/callgrind.h

@@ -0,0 +1,129 @@
+
+/*
+   ----------------------------------------------------------------
+
+   Notice that the following BSD-style license applies to this one
+   file (callgrind.h) only.  The rest of Valgrind is licensed under the
+   terms of the GNU General Public License, version 2, unless
+   otherwise indicated.  See the COPYING file in the source
+   distribution for details.
+
+   ----------------------------------------------------------------
+
+   This file is part of callgrind, a valgrind tool for cache simulation
+   and call tree tracing.
+
+   Copyright (C) 2003-2017 Josef Weidendorfer.  All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+
+   1. Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+   2. The origin of this software must not be misrepresented; you must
+      not claim that you wrote the original software.  If you use this
+      software in a product, an acknowledgment in the product
+      documentation would be appreciated but is not required.
+
+   3. Altered source versions must be plainly marked as such, and must
+      not be misrepresented as being the original software.
+
+   4. The name of the author may not be used to endorse or promote
+      products derived from this software without specific prior written
+      permission.
+
+   THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+   WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+   ----------------------------------------------------------------
+
+   Notice that the above BSD-style license applies to this one file
+   (callgrind.h) only.  The entire rest of Valgrind is licensed under
+   the terms of the GNU General Public License, version 2.  See the
+   COPYING file in the source distribution for details.
+
+   ----------------------------------------------------------------
+*/
+
+#ifndef __CALLGRIND_H
+#define __CALLGRIND_H
+
+#include "valgrind.h"
+
+/* !! ABIWARNING !! ABIWARNING !! ABIWARNING !! ABIWARNING !!
+   This enum comprises an ABI exported by Valgrind to programs
+   which use client requests.  DO NOT CHANGE THE ORDER OF THESE
+   ENTRIES, NOR DELETE ANY -- add new ones at the end.
+
+   The identification ('C','T') for Callgrind has historical
+   reasons: it was called "Calltree" before. Besides, ('C','G') would
+   clash with cachegrind.
+ */
+
+typedef
+   enum {
+      VG_USERREQ__DUMP_STATS = VG_USERREQ_TOOL_BASE('C','T'),
+      VG_USERREQ__ZERO_STATS,
+      VG_USERREQ__TOGGLE_COLLECT,
+      VG_USERREQ__DUMP_STATS_AT,
+      VG_USERREQ__START_INSTRUMENTATION,
+      VG_USERREQ__STOP_INSTRUMENTATION
+   } Vg_CallgrindClientRequest;
+
+/* Dump current state of cost centers, and zero them afterwards */
+#define CALLGRIND_DUMP_STATS                                    \
+  VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__DUMP_STATS,       \
+                                  0, 0, 0, 0, 0)
+
+/* Dump current state of cost centers, and zero them afterwards.
+   The argument is appended to a string stating the reason which triggered
+   the dump. This string is written as a description field into the
+   profile data dump. */
+#define CALLGRIND_DUMP_STATS_AT(pos_str)                        \
+  VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__DUMP_STATS_AT,    \
+                                  pos_str, 0, 0, 0, 0)
+
+/* Zero cost centers */
+#define CALLGRIND_ZERO_STATS                                    \
+  VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__ZERO_STATS,       \
+                                  0, 0, 0, 0, 0)
+
+/* Toggles collection state.
+   The collection state specifies whether the happening of events
+   should be noted or if they are to be ignored. Events are noted
+   by increment of counters in a cost center */
+#define CALLGRIND_TOGGLE_COLLECT                                \
+  VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__TOGGLE_COLLECT,   \
+                                  0, 0, 0, 0, 0)
+
+/* Start full callgrind instrumentation if not already switched on.
+   When cache simulation is done, it will flush the simulated cache;
+   this will lead to an artificial cache warmup phase afterwards with
+   cache misses which would not have happened in reality. */
+#define CALLGRIND_START_INSTRUMENTATION                              \
+  VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__START_INSTRUMENTATION, \
+                                  0, 0, 0, 0, 0)
+
+/* Stop full callgrind instrumentation if not already switched off.
+   This flushes Valgrinds translation cache, and does no additional
+   instrumentation afterwards, which effectivly will run at the same
+   speed as the "none" tool (ie. at minimal slowdown).
+   Use this to bypass Callgrind aggregation for uninteresting code parts.
+   To start Callgrind in this mode to ignore the setup phase, use
+   the option "--instr-atstart=no". */
+#define CALLGRIND_STOP_INSTRUMENTATION                               \
+  VALGRIND_DO_CLIENT_REQUEST_STMT(VG_USERREQ__STOP_INSTRUMENTATION,  \
+                                  0, 0, 0, 0, 0)
+
+#endif /* __CALLGRIND_H */