mie: re-implement vectors of blocks and registers using vector move callbacks

vector move callbacks allow mie_name instances to be stored in movable memory,
as the internal bst pointers can now be fixed during vector resize operations.

mie/ir/region.c

@@ -5,14 +5,5 @@
 
 struct mie_block *mie_region_add_block(struct mie_region *region)
 {
-	struct mie_block *block = malloc(sizeof *block);
-	if (!block) {
-		return NULL;
-	}
-
-	memset(block, 0x0, sizeof *block);
-
-	mie_vector_push_back(region->r_blocks, &block, NULL);
-
-	return block;
+	return mie_vector_emplace_back(region->r_blocks, &mie_block_vector_ops);
 }

mie/ir/register.c

@@ -0,0 +1,37 @@
+#include <assert.h>
+#include <mie/ir/register.h>
+
+static enum mie_status cleanup(void *p)
+{
+	mie_register_cleanup(p);
+	return MIE_SUCCESS;
+}
+
+static enum mie_status move(void *dst, void *src, size_t itemsz)
+{
+	assert(itemsz == sizeof(struct mie_register));
+	struct mie_register *dest_reg = dst, *src_reg = src;
+	mie_register_move(dest_reg, src_reg);
+	return MIE_SUCCESS;
+}
+
+struct mie_vector_ops mie_register_vector_ops = {
+	.v_destroy = cleanup,
+	.v_move = move,
+};
+
+void mie_register_move(struct mie_register *dest, struct mie_register *src)
+{
+	memmove(dest, src, sizeof *dest);
+
+	if (src->reg_flags & MIE_REGISTER_F_VIRTUAL) {
+		mie_name_move(&dest->reg_name, &src->reg_name);
+	}
+}
+
+void mie_register_cleanup(struct mie_register *reg)
+{
+	if (reg->reg_flags & MIE_REGISTER_F_VIRTUAL) {
+		mie_name_destroy(&reg->reg_name);
+	}
+}

mie/ir/walk.c

@@ -163,7 +163,7 @@ static enum mie_status schedule_children_of_region(
 	b_queue_entry *tmp = &item->i_entry;
 
 	for (size_t i = 0; i < MIE_VECTOR_COUNT(region->r_blocks); i++) {
-		struct mie_block *block = region->r_blocks.items[i];
+		struct mie_block *block = &region->r_blocks.items[i];
 		struct walk_schedule_item *child
 			= block_schedule_item_create(block);