Reduce the max heap size for 32 bit even more.

src/gc.c

@@ -676,11 +676,10 @@ static memsize_t max_total_memory = (memsize_t) 2 * 1024 * 1024 * 1024 * 1024 *
 #else
 typedef uint32_t memsize_t;
 static const size_t default_collect_interval = 3200 * 1024 * sizeof(void*);
-static const size_t max_collect_interval =  500000000UL;
 // Work really hard to stay within 2GB
 // Alternative is to risk running out of address space
 // on 32 bit architectures.
-static memsize_t max_total_memory = (memsize_t) 2 * 1024 * 1024 * 768; // The new heuristics use all the heap, which makes it run out
+static memsize_t max_total_memory = (memsize_t)  1024 * 1024 * 1024; // The new heuristics use all the heap, which makes it run out
 #endif
 
 // global variables for GC stats