VG_CONCAT4        731 base/third_party/valgrind/valgrind.h #define VG_CONCAT4(_aa,_bb,_cc,_dd) _aa##_bb##_cc##_dd
VG_CONCAT4        653 third_party/re2/util/valgrind.h #define VG_CONCAT4(_aa,_bb,_cc,_dd) _aa##_bb##_cc##_dd