Pass tsd down to prof_backtrace()

src/prof.c

@@ -430,9 +430,8 @@ prof_backtrace_impl(prof_bt_t *bt) {
 #endif
 
 void
-prof_backtrace(prof_bt_t *bt) {
+prof_backtrace(tsd_t *tsd, prof_bt_t *bt) {
 	cassert(config_prof);
-	tsd_t *tsd = tsd_fetch();
 	pre_reentrancy(tsd, NULL);
 	prof_backtrace_impl(bt);
 	post_reentrancy(tsd);

src/prof_log.c

@@ -246,7 +246,7 @@ prof_try_log(tsd_t *tsd, const void *ptr, size_t usize, prof_tctx_t *tctx) {
 	prof_bt_t bt;
 	/* Initialize the backtrace, using the buffer in tdata to store it. */
 	bt_init(&bt, cons_tdata->vec);
-	prof_backtrace(&bt);
+	prof_backtrace(tsd, &bt);
 	prof_bt_t *cons_bt = &bt;
 
 	/* We haven't destroyed tctx yet, so gctx should be good to read. */