operand memory manager. Operands are suballocated out of this block. The
MEM array varies in size. */
-struct GTY((chain_next("%h.next"))) ssa_operand_memory_d {
+struct GTY((chain_next("%h.next"), variable_size)) ssa_operand_memory_d {
struct ssa_operand_memory_d *next;
char mem[1];
};