glsl2: Steal the live IR and free the rest of the junk.

src/glsl/main.cpp

@@ -99,6 +99,12 @@ const struct option compiler_opts[] = {
    { NULL, 0, NULL, 0 }
 };
 
+static void
+steal_memory(ir_instruction *ir, void *new_ctx)
+{
+   talloc_steal(new_ctx, ir);
+}
+
 void
 compile_shader(struct gl_shader *shader)
 {
@@ -187,6 +193,11 @@ compile_shader(struct gl_shader *shader)
 
    shader->InfoLog = state->info_log;
 
+   /* Retain any live IR, but trash the rest. */
+   foreach_list(node, shader->ir) {
+      visit_tree((ir_instruction *) node, steal_memory, shader);
+   }
+
    talloc_free(state);
 
    return;