vc4: Tell valgrind about BO allocations from mmap time to destroy.

This helps in debugging memory pressure.  It would be nice if we could
tell valgrind about it all the way from allocation time to destroy, but we
need a pointer to hand to VALGRIND_MALLOCLIKE_BLOCK.

src/gallium/drivers/vc4/Makefile.am

@@ -32,6 +32,7 @@ AM_CFLAGS = \
 	$(VC4_CFLAGS) \
 	$(GALLIUM_DRIVER_CFLAGS) \
 	$(SIM_CFLAGS) \
+	$(VALGRIND_CFLAGS) \
 	$()
 
 noinst_LTLIBRARIES = libvc4.la

src/gallium/drivers/vc4/vc4_bufmgr.c

@@ -35,6 +35,14 @@
 #include "vc4_context.h"
 #include "vc4_screen.h"
 
+#ifdef HAVE_VALGRIND
+#include <valgrind.h>
+#include <memcheck.h>
+#define VG(x) x
+#else
+#define VG(x)
+#endif
+
 static bool dump_stats = false;
 
 static void
@@ -209,6 +217,7 @@ vc4_bo_free(struct vc4_bo *bo)
                 }
 #endif
                 munmap(bo->map, bo->size);
+                VG(VALGRIND_FREELIKE_BLOCK(bo->map, 0));
         }
 
         struct drm_gem_close c;
@@ -618,6 +627,7 @@ vc4_bo_map_unsynchronized(struct vc4_bo *bo)
                         bo->handle, (long long)offset, bo->size);
                 abort();
         }
+        VG(VALGRIND_MALLOCLIKE_BLOCK(bo->map, bo->size, 0, false));
 
         return bo->map;
 }