Check for oom in a few more places

src/rt/memory_region.cpp

@@ -87,6 +87,10 @@ memory_region::realloc(void *mem, size_t orig_size) {
 
     size_t size = orig_size + HEADER_SIZE;
     alloc_header *newMem = (alloc_header *)::realloc(alloc, size);
+    if (newMem == NULL) {
+        fprintf(stderr, "memory_region::realloc> Out of memory allocating %ld bytes", size);
+        abort();
+    }
 
 #   if RUSTRT_TRACK_ALLOCATIONS >= 1
     assert(newMem->magic == MAGIC);
@@ -118,6 +122,10 @@ memory_region::malloc(size_t size, const char *tag, bool zero) {
     size_t old_size = size;
     size += HEADER_SIZE;
     alloc_header *mem = (alloc_header *)::malloc(size);
+    if (mem == NULL) {
+        fprintf(stderr, "memory_region::malloc> Out of memory allocating %ld bytes", size);
+        abort();
+    }
 
 #   if RUSTRT_TRACK_ALLOCATIONS >= 1
     mem->magic = MAGIC;