aco/reindex_ssa: free memory of previous live variable sets

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30182>

src/amd/compiler/aco_reindex_ssa.cpp

@@ -84,11 +84,12 @@ reindex_ssa(Program* program, bool update_live_out = false)
    idx_ctx ctx;
    reindex_program(ctx, program);
    if (update_live_out) {
+      monotonic_buffer_resource old_memory = std::move(program->live.memory);
       for (IDSet& set : program->live.live_in) {
          IDSet new_set(program->live.memory);
          for (uint32_t id : set)
             new_set.insert(ctx.renames[id]);
-         set = new_set;
+         set = std::move(new_set);
       }
    }
 

src/amd/compiler/aco_util.h

@@ -247,6 +247,18 @@ public:
       free(buffer);
    }
 
+   /* Move-constructor and -assignment */
+   monotonic_buffer_resource(monotonic_buffer_resource&& other) : monotonic_buffer_resource()
+   {
+      *this = std::move(other);
+   }
+   monotonic_buffer_resource& operator=(monotonic_buffer_resource&& other)
+   {
+      release();
+      std::swap(buffer, other.buffer);
+      return *this;
+   }
+
    /* Delete copy-constructor and -assignment to avoid double free() */
    monotonic_buffer_resource(const monotonic_buffer_resource&) = delete;
    monotonic_buffer_resource& operator=(const monotonic_buffer_resource&) = delete;