ATRONIX: by Shixin Zeng - Remove free'd serieses from GC_Infants

reported by address sanitizer with manual poisonation:

=================================================================
==11513==ERROR: AddressSanitizer: use-after-poison on address 0x7efe281542c0 at pc 0x00000071038f bp 0x7ffdc9de9330 sp 0x7ffdc9de9328
READ of size 4 at 0x7efe281542c0 thread T0
    0 0x71038e in Mark_Series /home/zsx/stuffs/work/r3.git/make/../src/core/m-gc.c:501:6
    1 0x70ea8b in Recycle /home/zsx/stuffs/work/r3.git/make/../src/core/m-gc.c:744:4
...

Author: Oldes

src/core/m-pools.c

@@ -529,6 +529,12 @@ const REBPOOLSPEC Mem_Pool_Spec[MAX_POOLS] =
 
 	Free_Node(SERIES_POOL, (REBNOD *)series);
 
+	/* remove from GC_Infants */
+	for (n = 0; n < MAX_SAFE_SERIES; n++) {
+		if (GC_Infants[n] == series)
+			GC_Infants[n] = NULL;
+	}
+
 /* Old torture mode:
 	if (!SERIES_FREED(series)) { // Don't try to free twice.
 		MUNG_CHECK(SERIES_POOL, (REBNOD *)series, Mem_Pools[SERIES_POOL].wide);